Swimming — Slow Alternation: A Complete Guide
Quick Intro
Swimming — Slow Alternation is a mat Pilates exercise performed lying face down with the arms and legs extended and the chest and legs lifted off the mat, alternating opposite arm and leg at a slow, deliberate two-count pace, well short of the rapid flutter of the full version. Slowing the alternation down while keeping the same lifted hold is what makes this the easier way into Swimming.
Equipment Needed
No equipment is required. A Yoga Mat underneath is an optional way to cushion the hips and ribs against a hard floor.
Why It Matters
Maintaining the lifted extension at a slower pace still asks for back flexibility, and holding both the extension and the alternating rhythm steady over a longer, more deliberate count takes staying power on top of the coordination. The lower back muscles (erector spinae) hold the sustained extension through the slower count, and the largest glute muscle (gluteus maximus) keeps the legs lifted through the alternation. A muscle at the back of the thigh (hamstrings, biceps femoris) drives each leg’s slower beat, the rear of the shoulder (deltoid, posterior) powers the arm alternation and the broad muscle spanning the upper back and neck (trapezius) supports the lifted upper body throughout.
When to Do It
Swimming — Slow Alternation works well in the prone portion of a Pilates mat session, usually placed as the entry point before the pace speeds up toward the full flutter. Two to three sessions a week is a reasonable pace for building this slower pattern.
Anyone with a current lower back issue should get individual guidance before adding this exercise, since sustaining a lifted extension places ongoing demand on the lumbar spine even at a slower pace.
Getting Ready
A few rounds of a simpler back extension, without any alternation, warm up the spinal extensors before the slower pattern is added. A single slow, deliberate opposite-arm-and-leg lift, held briefly, previews the pace the full set will use.
Step-by-Step Instructions
1. The setup. Lie face down with the arms and legs extended, lifting the chest and legs slightly off the mat.
2. The slow alternation. Begin alternating opposite arm and leg at a deliberate two-count pace.
3. The breath. Inhale for the first two counts, then exhale for the next two, keeping the pace steady throughout.
4. The finish. Bring the chest and legs back down to the mat under control once the set has run its course.
How Many, How Often
Swimming — Slow Alternation is dosed by total count, with each two-count inhale or exhale phase of the alternation counting toward the set.
| Level | Where you’re at | What to do |
|---|---|---|
| Beginner | New to sustaining the lifted extension at any pace | 2 sets of 8 counts, keeping the lift smaller |
| Intermediate | The extension holds steady through a longer slow count | 2 to 3 sets of 16 counts |
| Advanced | Comfortable sustaining a full extension at the slower pace | 3 sets of 24 counts |
The extension staying smooth through the whole spine matters more here than how many counts get completed, since a longer set with a collapsing extension gives up the extension for a bigger-looking total.
Modifications and Variations
The step up from this version is the rapid flutter.
Compared to Swimming, this version slows the opposite-arm-and-leg alternation down to a deliberate pace, which reduces the cardiovascular and coordination demand while keeping the extended, lifted position. Once the slower pace feels controlled, speeding the alternation up gradually toward the full flutter of Swimming is the natural next step.
Common Mistakes to Avoid
Letting the lower back overextend as the count continues. Allowing the lumbar spine to arch more sharply as fatigue builds adds unnecessary strain right where it’s least wanted. A braced core protects the lower back through the whole count.
Letting the pace creep up without meaning to. Speeding up the alternation as the pattern becomes familiar skips the control this deliberately slow version is designed to build. Checking the count against the breath throughout the set keeps the pace where it should be.
Letting the chest or legs drop partway through the count. Allowing the lifted position to sink as the slower pace continues undermines the sustained extension the exercise depends on. Keeping the chest and legs at a consistent height, even if that means a shorter set, keeps the extension doing its work.
After Your Set
Folding forward with the hips toward the heels and the arms resting ahead on the mat unwinds the spine after a set spent holding a sustained extension. A gentle cross-body shoulder stretch on each arm finishes releasing the shoulders that powered the slower alternation.
Going Deeper
This exercise usually works well as a way to build the sustained extension and coordination the full-speed flutter needs, without the added cardiovascular and timing demand of a rapid pace testing that extension before it exists. The pace tends to speed up unnoticed as the pattern becomes familiar, undermining the deliberate control this slower version is meant to train. Keeping the alternation consciously slow, even once it starts to feel easy, builds endurance faster than letting the pace drift upward.
Someone new to this exercise generally manages a shorter slow count within a few sessions, then works toward a longer, sustained slow count over two to three weeks.
How to Know You’re Improving
- An extension that stays smooth through the whole spine, not concentrated in the lower back
- A pace that stays deliberately slow through the whole set
- A breath count that stays paced
- A total count that grows while the extension stays controlled
A lower back that never overextends through the slower count matters more than how many counts get finished.
Muscles Worked
- Erector Spinae (the lower back muscles, holding the sustained extension through the slower count)
- Gluteus Maximus (the largest glute muscle, keeping the legs lifted through the alternation)
- Biceps Femoris (a muscle at the back of the thigh, driving each leg’s slower beat)
- Posterior Deltoid (the rear of the shoulder, powering the arm alternation)
- Trapezius (the broad muscle spanning the upper back and neck, supporting the lifted upper body throughout)
FAQ
What’s the point of practicing the alternation this slowly? A slower, deliberate alternation reduces the cardiovascular and coordination demand of the full flutter while keeping the extended, lifted position, which makes the pattern easier to learn before speed is added.
When is it time to speed the alternation up? When the slower pace feels controlled, with the extension staying smooth through the whole count, pick up the pace gradually toward the full flutter of Swimming.
Is some lower back or shoulder fatigue after this exercise normal? Yes, fatigue through the lower back and shoulders after a full slow count is expected. A pain that feels sharp and stays confined to the lumbar spine is different, and worth a doctor or physical therapist’s opinion if it continues.
Is it normal for the pace to feel harder to control as fatigue builds? Yes, some natural difficulty holding the slow pace as fatigue builds is common, especially when first learning the pattern. Keeping the rhythm deliberately slow even at reduced counts is more valuable than rushing to finish a longer set.
How often should the slow Swimming be practiced? Two to three times a week, as part of the prone portion of a broader mat session, is enough repetition to build this slower pattern.
Related to Swimming as the harder version with the rapid flutter.