Build Your Engine in the Pool Without Perfect Freestyle
Updated: Oct 15
THE BREAKDOWN · ENGINE · BY COACH FRITZ
You jump in the pool, swim two laps, and your heart rate feels like a 5K finish.
That is not a fitness problem. It is mostly a skill problem, and it is why so many land athletes write off the pool after one bad try. I grew up swimming in the Philippines, and I still think it is one of the most underused tools for building an engine, especially when your legs or joints need a break from pounding.
Here is what I want you to leave with: why swimming feels so hard at first, three technique pieces that make each lap cheaper, and three sample sessions you can take to the pool this week.
IN THIS ARTICLE
Why the Pool Feels So Hard (and Why It Is Fixable)
On a run or a rower, you have years of practice making the movement cheap. In the water you are horizontal, you cannot breathe whenever you want, and every wasted motion costs you. Most land athletes do the same four things: drop their hips, lift their head, kick like crazy and hold their breath. That burns oxygen fast, and you stop at 25 meters feeling wrecked.
It is worth fixing. Swimming is low-impact, so it gives you a way to do easy aerobic work when running mileage or jumping volume is stacking up. Easy aerobic work builds your base whether it happens on a bike, a rower or in a lane. The pool also forces you to breathe out with a steady rhythm, and that carries over to workouts where you feel like you cannot catch your air.
One adjustment before you start. Coach by effort, not by the heart rate numbers you use on land. Wrist readings are often unreliable in the water, and the same effort can feel different there. I use RPE on a 1 to 10 scale. Easy aerobic swimming sits around 4 to 5, where you could say a full sentence at the wall.
Three Technique Pieces That Make Laps Cheaper
You do not need a pretty stroke. You need a stroke that wastes less. These are the three things I would fix first, in this order.
Float level. Look at the bottom of the pool with your head neutral, like your neck is long. Press your chest down slightly and your hips will rise. When the legs sink, everything gets harder.
Breathe out the whole time your face is in the water. Slow, steady bubbles, then rotate and take a quick breath in. Holding your breath builds that desperate feeling after a few strokes, and it is the biggest reason beginners gas out.
Small kick, long reach. Kick from the hips with loose ankles and keep it quiet. Reach forward and glide a touch. Count your strokes per length, then try to lower that count by one without slowing down.
Coach's cue: Bubbles out, the whole time.
A mistake I see a lot, and one I would expect to see in anyone's first pool video, is the head lifted to look forward. It snaps the hips down and turns the legs into an anchor. Look down, let the water hold your head, and the whole body gets lighter. If your pool allows it, have someone film you from the side of the lane. You will see it in two seconds.
Three Sample Pool Sessions
These assume a 25-meter or 25-yard pool. Rest means hanging on the wall until your breathing is calm and you could talk. If you are not settled by the listed rest, take more. Quality beats a clock here.
Session 1: Technique and easy aerobic (about 30 minutes). Warm up with 4 x 25 easy, 20 seconds rest. Then 8 x 25 focusing on one cue per length: level head, bubbles, then small kick. Finish with 4 x 50 at RPE 4 to 5, 30 seconds rest. Walk or float 2 minutes to cool down.
Session 2: Aerobic builder (about 35 minutes). Warm up with 4 x 25 easy. Main set is 5 x 100 at RPE 5 to 6, 30 seconds rest. Hold the same stroke count every length. If you are comfortable in the first two, add a sixth. Cool down with 2 x 50 easy.
Session 3: Short intervals (about 30 minutes). Warm up with 6 x 25 easy. Main set is 8 x 50 at RPE 7, leaving every 1:30 if you finish in about 50 to 60 seconds, or every 2:00 if you need more time. Smooth speed only. When your stroke falls apart, stop the set and swim 2 easy lengths.
If you can only swim 25 meters before you need a rest, start there. Do 12 to 16 lengths of 25 with generous rest and treat the total as your session. Two weeks later you will be stringing 50s together, and that jump usually comes from technique, not fitness.
Fitting the Pool Into Your Week
Start with one pool session a week for four to six weeks. Swap it for an easy run, bike or row day, not for your hard workouts. Sessions 1 and 2 are good low-stress aerobic days. Session 3 counts as a harder day, so place it away from your toughest class and give it the same respect you would give any interval work.
Expect your shoulders and upper back to feel it early, since you are doing repeated overhead reaching on top of your normal training. If you are already doing a lot of gymnastics or pressing, keep the pool volume low at first and build slowly. Your lats and the muscles around the shoulder blade are working in ways that your workouts may not train.
Never swim alone, and choose a pool with a lifeguard when you can. Do not do breath-holding or "hypoxic" sets, where you purposely hold your breath for many strokes or lengths. Blacking out in the water is a real risk, even for fit people. If you feel dizzy or lightheaded, stop and get out. If you are not comfortable in deep water, stay in a lane where you can stand and ask the lifeguard or a swim coach for help. Pain in the shoulder that lingers after swimming should be checked by a qualified professional.
Track each session in your log with total distance, stroke count per length and RPE. You will see the stroke count drop before your pace changes, and that is your first sign the engine is getting cheaper to run.
Where I Stand
I would rather see you swim easy once a week than add a third hard bike session to your plan. Most CrossFit athletes I talk to already have plenty of intensity and not enough low-stress aerobic work. The pool is a humbling place to get it, and I think that is the point. Technique first, pace later.
Try this today: Swim 8 x 25 meters easy at RPE 4 to 5, resting 20 to 30 seconds on the wall, and breathe out the whole time your face is in the water. Count your strokes on each length and see if you can lower the number by one across the set.
Pool Conditioning Quick Recap
It is a skill problem first. Gasping after two laps usually comes from sinking hips, a lifted head and held breath, not from a weak engine.
Use effort, not land heart rate. Coach easy swimming at RPE 4 to 5 and keep watch readings as a rough guide at best.
Fix three things in order. Float level, breathe out the whole time, and use a small kick with a long reach.
Start with technique sets. Short lengths with a single cue and generous rest teach more than one long, ugly swim.
One session a week is enough. Swap it for an easy day, and treat the interval session like any other hard workout.
Respect the water. No lone swims, no breath-holding sets, and get shoulder pain checked by a qualified professional.
The Lap You Swim Easy Today
The pool will not flatter you at first, and that is fine. Every smooth, quiet length you swim now is aerobic work that does not beat up your legs, and it teaches you to stay calm when your body wants to panic.
Pick a day this week, bring a swim cap and a plan, and keep the first session boring on purpose. Boring is how the base gets built.
If you want easy aerobic days like this placed into a full training week for you, take a look at Sphere Programming.
Your turn. How far can you swim right now before you need to stop at the wall, and is it your breathing or your legs that gives out first? Tell me in the comments below. I read every one, and your answers shape what I write next. If this helped, tap the heart so it reaches more athletes.
Keep reading
Further reading: American College of Sports Medicine (ACSM)
Coach Fritz Bautista · Head Coach, ATHLETESPHERE
CrossFit Level 2 Trainer (CF-L2) ✓ · CrossFit Programming Certificate · MBA Graduate · Digital Marketing Certified · Coaching athletes from all walks of life online
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