Pillar One: Anterior Trunk and Anti-Extension Core Strength

To understand why core training for swimmers needs to look different than what you’d program for almost any other athlete, you have to first understand what’s happening biomechanically every time you push off a wall and take a stroke. Whether the athlete is swimming freestyle, butterfly, or breaststroke, the spine is being placed into an extended position for long periods of time, repetitively, often under load and resistance from the water itself. We’re talking about thousands of repetitions per training session with the lumbar spine in extension, and that volume creates real compressive stress through the lower back. This is precisely why so many competitive swimmers end up dealing with chronic lower back pain, especially as their training volume ramps up during peak phases of the season.

The conventional advice swimmers tend to receive when low back issues show up is to stretch the hip flexors. While that recommendation isn’t necessarily wrong, it’s a small piece of a much bigger puzzle. The real solution is to build serious anterior trunk and core strength to counterbalance all of that spinal extension. We need to train hip flexion and spinal flexion under control, with quality and intent, rather than just chasing mobility in one direction. The body needs to be strong in the opposite movement pattern of what it’s constantly being placed in, otherwise the imbalance only gets worse over time.

The single most effective exercise I’ve found for accomplishing this with swimmers is the stability ball pike-up. The beauty of this movement is that it gives you two adaptations in one exercise. When performed correctly, you start in a controlled plank position with your shins or feet on the ball, which trains anti-extension and builds tremendous rigidity through the midsection. From there, you drive your hips up toward the ceiling, creating active hip flexion that strengthens the hip flexors while also producing the spinal flexion that counterbalances all the extension you accumulate in the water. It’s two birds with one stone, and the equipment cost is essentially nothing.

From a programming standpoint, I recommend two to four sets of as many quality reps as possible. If you’re not yet able to hit ten clean repetitions, perform as many as you can with good technique and then hold the plank position for an additional ten, fifteen, or twenty seconds to continue developing midsection rigidity. Over time, you build up your rep capacity. The key here is tempo. You’re not racing through these. Pike your hips up slow and controlled, and then take two to three seconds to lower back down to the flat plank position. That eccentric control is what teaches your trunk to handle load in those extended positions you’ll encounter in the pool. Done sloppy and fast, this exercise loses most of its value.

You can perform this exercise one to two times per week, sometimes more if equipment is limited and you’re training at home with just a stability ball. I do recommend rounding out your core training with other quality anterior chain exercises like hanging leg raises and ab fallouts to give the midsection a more complete training stimulus. As long as you’re hitting two to four quality sets in the ten to twenty rep range one to two times per week, you’ll be in great shape.

Pillar Two: Bilateral Lower Body Strength

This is the area where most swimmers and even a fair number of swim coaches drop the ball. There’s a long-standing assumption that because swimming is an upper-body dominant sport, lower body strength training simply doesn’t matter all that much. That assumption is wrong on two important fronts.

The first reason swimmers need significant lower body strength is that every explosive movement in the sport, from the start off the blocks, to flip turns at the wall, to underwater kicking out of breakouts, requires lower body power. And here’s the part that gets overlooked: you cannot build power without first building a foundation of general strength. This is just basic force-velocity curve physiology. The stronger you become, the more force you can produce, and the more force you can produce, the harder you can push off that wall and the more powerful your starts become. Power output is downstream of strength, period. Skipping the strength work and trying to jump straight to power development is going to leave a lot of performance on the table.

The second reason is bone mineral density, and this is one of the most important and most ignored issues in swimming. Because the pool is a non-impact environment, swimming doesn’t load the skeletal system the way running, jumping, or other land-based activities do. The water makes you feel lighter, which is exactly why swimming is such a fantastic option for older populations and people coming back from injury. But for serious swimmers spending the majority of their training time in the pool, the research is clear: swimmers consistently demonstrate significantly lower bone mineral density than athletes in impact-based sports. This becomes a real problem when swimmers transition into running for triathlons, take up other recreational activities, or simply try to handle the demands of normal daily life. Stress fractures and bone-related injuries become much more likely when the skeletal system has been under-stimulated for years.

This is where heavy bilateral lower body strength training becomes non-negotiable. My two preferred exercises for swimmers are the trap bar deadlift and a squat variation. The trap bar deadlift is hard to beat as a primary strength movement for swimmers. It’s significantly easier to teach than a conventional or sumo deadlift, making it incredibly beginner-friendly and accessible to younger or newer athletes. It also has a more quad-dominant feel than a conventional deadlift, which translates well to the demands of pushing off walls and blocks where the legs have to drive out of a deeper, flexed position. Because the bar starts on the floor each rep, the trap bar also lets you train rate of force development effectively. You can either go heavier with sets of one to five reps leaving one to two reps in the tank, or you can drop the weight and pull the bar as explosively as possible to specifically train rate of force development. Both approaches are valuable depending on the athlete and the time of year.

The second movement is a squat pattern, and I’m biased toward front squats for the majority of my athletes. That said, back squats, safety bar squats, box squats, belt squats, and even goblet squats can all work depending on what you have access to and what your body responds to best. The non-negotiable here is that you need to be squatting on both legs with appreciable load. Going through the motions with a twenty-pound dumbbell is not going to give you the adaptations you need. The reason squats complement deadlifts so well is that the squat starts with an eccentric phase, which means you’re under more sustained mechanical tension than you are during a deadlift where the bar can rest on the floor between reps. That sustained tension is fantastic for building muscle mass on the legs, which is especially valuable for younger or smaller swimmers who need to develop more overall structure. I typically program squats for three to four sets of three to six reps depending on time of year. Squats tend to fit better in the off-season when swimming volume is lower and the athlete has more recovery capacity to handle the eccentric load, while deadlifts tend to be more friendly during in-season and competitive phases when recovery is at more of a premium.

Pillar Three: Plyometric Training for Power and Bone Density

Plyometric training accomplishes two critical jobs for swimmers simultaneously, which is why it earns its own pillar in the program. The first is overall power development. The second is the bone mineral density stimulus we discussed earlier. Research on youth athletes has demonstrated that plyometric training, specifically jumping and landing, provides exactly the type of mechanical loading needed to build bone density. One study showed that as little as ten maximal jumps performed three sets at three times per week was enough to produce significant improvements in bone density in youth athletes. That’s a remarkably small dose for a remarkably big return.

Now, when it comes to actually programming jumps for swimmers, there’s an important distinction to understand. Box jumps are a great teaching tool. They allow athletes to learn how to use their arms, drive through their hips, and land in an athletic position, and no offense to the swimming community, but if all you’ve ever done is swim, your jumping mechanics probably need some work. Box jumps are great for developing those basics. However, once an athlete understands how to jump and land properly, you have to progress beyond the box jump because the box jump effectively removes the eccentric and impact component. By raising the floor up to meet the athlete, you eliminate the very stimulus we’re trying to create.

This is why I prefer to progress swimmers into hurdle hop variations, depth drops to broad jumps, and weighted jump variations once their basic mechanics are solid. These exercises produce real eccentric stress and real ground contact, which is what drives both the power adaptation and the bone density adaptation we want. If your plyometrics aren’t producing landing impact on the ground, you’re missing the entire point.

When choosing specific jump variations, the two I lean on most heavily for swimmers are broad jump variations and loaded jump variations. Broad jumps and their progressions, including hurdle hop to broad jump and depth drop to broad jump combinations, are excellent because they emphasize horizontal power production, which mirrors the directional power swimmers need off walls and off blocks. Loaded jumping variations are valuable because the added load slows the movement down slightly, places the athlete more squarely in the strength-speed range of the force-velocity curve, and still delivers the impact needed for bone stimulus. For most athletes, holding five to fifteen pound dumbbells in each hand or jumping against the lightest available resistance bands is more than enough load to produce the desired effect. Don’t get carried away with the weight, because once the load gets too heavy, you lose the speed component that makes the exercise a plyometric in the first place.

In terms of placement, I program plyometrics at the beginning of every training session, regardless of what else is happening that day. This serves two purposes. The athlete is fresh and able to put maximal effort into each rep, and the body is exposed to the power stimulus frequently throughout the week, which is what power adaptations actually require. Power, unlike maximal strength or aerobic capacity, responds best to frequent dosing with high quality. Twenty to thirty total jumps per session for a given exercise tends to be the sweet spot. Enough volume to produce adaptation, not so much that recovery becomes a problem.

Pillar Four: Energy System Development Outside the Pool

The fourth pillar tends to surprise swimmers when they first hear it. The thinking goes: I already swim thousands of yards every day, so why on earth would I need to do more conditioning outside the pool? It’s a fair question, but the answer is rooted in some interesting physiology.

The energy system work you do in the pool is highly specific to the strokes you swim and the events you compete in. That specific aerobic capacity is critical, but it doesn’t necessarily translate into the broader, deeper aerobic base that drives recovery between sessions. Building a robust aerobic engine through varied modalities outside of the pool enhances your recovery capacity between training sessions, helps you feel better day to day, and gives you a bigger overall engine to draw from when you step on the deck. There’s compelling data and research from Russian swimming programs showing that even sprint-based swimmers benefit substantially from dedicated aerobic development phases. As a former competitive powerlifter, I can speak to this from personal experience as well. When my aerobic base improved, my recovery between training sessions improved dramatically, even though powerlifting is the furthest thing from an aerobic sport. Swimming is no different.

For sprint-based swimmers especially, this is the way to think about aerobic conditioning outside the pool: it isn’t about making you a better distance swimmer, it’s about giving you the recovery capacity to train harder more often. Every session you walk into more recovered is a session where you can give a higher quality effort, and over the course of a season, those quality efforts compound into real performance gains.

The two modalities I lean on most for swimmer conditioning are sled push variations and bike intervals. Sled pushes for distances of fifty to one hundred yards work beautifully. Time how long it takes you to complete the distance, rest for an equal amount of time, and continue cycling through pushes for twenty to thirty minutes total. You shouldn’t be smoked at the end of each rep, because the goal is sustainable aerobic work, not a metabolic blowout. Build up to thirty minutes of total work over time. The other option, and the one I personally lean toward more, is bike intervals. Thirty seconds at a moderately hard pace followed by thirty seconds of easy pedaling, repeated for twenty to thirty minutes, gives you a fantastic aerobic stimulus without much wear and tear on the body. Rowers and ski ergs work just as well if those are what you have access to.

The bike approach is particularly well-suited to in-season maintenance. Aerobic work is generally easy to recover from, and bikes provide active recovery that helps flush the body after pool sessions. As your swimming volume climbs during the competitive season, you want easy ways to maintain your aerobic base without adding fatigue, and a bike is about as accessible as it gets.

Putting It All Together: Programming Strength Training Around Swimming

Pulling all four pillars into one cohesive program comes down to time of year and how you structure your weekly training. Most swimmers should be in the strength and conditioning facility one to three times per week pretty much year-round, with frequency scaling inversely to swim volume. As pool volume climbs during the competitive season, strength training drops down to one to two sessions per week, focused on maintaining the qualities you built. During the off-season, when pool yardage is lower, strength training bumps up to two to three sessions per week so you can develop genuine improvements in strength, power, and aerobic base.

Each strength session should include either a squat or deadlift pattern as the primary lower body movement, plyometric work performed at the beginning of the session when the athlete is fresh, dedicated midsection training with an anti-extension or hip flexion focus, and some upper body work selected based on the athlete’s needs and preferences. Push-ups, bench press variations, overhead pressing, rows, pull-downs, and chin-ups all have a place. Outside of the strength sessions, layer in one to two conditioning sessions per week year-round to build and maintain aerobic capacity.

Done correctly, this four-pillar approach addresses the actual biomechanical demands of swimming, prevents the most common chronic injuries the sport produces, builds the explosive power needed for starts, turns, and walls, and provides the bone density and recovery capacity that long-term swimming careers require. It’s not flashy, and it’s not built around the latest fitness trends, but it works because it’s grounded in the actual physiology of the sport. Build these four pillars consistently over the course of a season, and you’ll see your times in the pool drop, your injuries decrease, and your overall ability to handle training volume climb significantly.

If you’re a swimmer, coach, or parent looking to build a smarter dryland program, start with these four pillars and don’t overcomplicate things. Master the basics, train with intent, and trust the process.