Running on Reformer: A Complete Guide
Also called Reformer Running
Quick Intro
Running on the reformer is performed lying on the carriage from a parallel toe position on the footbar with the carriage held fully out, alternating one heel pressing down as the other lifts in a rapid, small pulse that mimics a running motion. The carriage doesn’t move during this exercise, only the heels alternate, stretching the calves one side at a time while the legs stay pressed out against the springs, usually performed as a cool-down right after the Footwork series.
Equipment Needed
A Pilates Reformer is required, with no substitute possible, since the held-out carriage and its spring tension are the mechanism being trained. It is the only piece of equipment the exercise uses.
Why It Matters
Alternating a quick heel drop against held spring tension asks for calf flexibility, and sustaining that alternation for a full set takes staying power and precise timing between the two legs.
A calf muscle (gastrocnemius) and a deeper calf muscle beneath it (soleus) drive the alternating heel drop and lift, and a muscle at the back of the thigh (hamstrings, biceps femoris) helps hold the legs pressed out against the springs. The front of the thigh (quadriceps, rectus femoris) keeps the knees extended throughout, and a muscle along the front of the shin (tibialis anterior) draws the toes toward the shin as each heel drops.
When to Do It
Running fits directly after the Footwork series, using the same held-out carriage position as a transition into the next part of a reformer session. Two to three sessions a week is a reasonable pace for building this ankle isolation. Anyone with a current calf or Achilles issue should get individual guidance before adding it, since the alternating heel drop places repeated stretch load on both.
Getting Ready
A few slow, deliberate heel drops on one side at a time preview the alternating pattern before the faster pace begins. Holding the carriage out for a breath or two without moving the heels confirms the legs can stay pressed out steadily before the pulses start.
Step-by-Step Instructions
1. The setup. From a parallel toe position, press the carriage fully out and hold it there.
2. The alternation. Begin alternating one heel pressing down as the other lifts, in small, quick pulses.
3. The pace. Continue the rapid alternation for the working set, keeping the pelvis still throughout.
4. The release. Return the carriage in with control once the set is complete.
How Many, How Often
Running is dosed by total heel taps, with each alternation (one heel down, one heel up) counting as one.
| Level | Where you’re at | What to do |
|---|---|---|
| Beginner | New to holding the carriage out while alternating | 2 sets of 15 to 20 taps, at a moderate pace |
| Intermediate | The pelvis stays still through a steady alternation | 2 to 3 sets of 20 to 25 taps |
| Advanced | Comfortable with a fast, sustained alternation | 3 sets of 25 to 30 taps |
The pelvis staying still matters more here than how fast the heels alternate, since a rocking pelvis is the clearest sign the pace has outrun the control needed to hold the carriage steady.
Modifications and Variations
As an easier version, Running — Slow Alternation slows the heel-pulse pace considerably, letting the held-carriage position and the alternating pattern both be learned without the speed demand of the full version.
As a harder version, Running — Faster Tempo raises the alternation to a near-jogging rhythm, asking for faster reactive control from the calves while the pelvis stays rock-steady under a higher rate of spring loading.
Common Mistakes to Avoid
Letting the carriage drift or move during the alternation. Allowing the carriage to creep in or out while the heels alternate means the legs aren’t holding it steady the way this exercise is built to train. The carriage should stay fully extended and motionless for the entire set.
Letting the pelvis rock side to side with each heel tap. Allowing the hips to shift as the heels alternate turns an isolated ankle exercise into a whole-body compensation. Only the ankles need to move, so keeping the pelvis still is what keeps the work in the ankles.
Rushing the pace before the pattern is steady. Speeding up the alternation before the pelvis can stay still and the carriage can stay held turns a controlled drill into an uncontrolled flail. Building speed only once the steadier pace feels solid protects the quality of the exercise.
After Your Set
A calf stretch against the foot bar, one heel reaching down at a time, releases the muscles that just alternated through the pulses. A gentle ankle circle on each side eases out any tightness the rapid pace left behind.
Going Deeper
This exercise trains ankle control under sustained load, since alternating a fast heel pulse while the pelvis stays anchored and the carriage stays held asks the ankles to move apart from the rest of the body. As the pace speeds up, the pelvis is often the first thing to give in and start rocking to help keep up. Slowing the tempo back down until the pelvis holds steady again, even mid-set, protects the isolation this exercise trains.
Someone new to this exercise generally holds a steady, moderate alternation within the first couple of sessions, then works toward a faster, sustained pace over two to three weeks.
How to Know You’re Improving
- A carriage that stays fully extended and motionless through the whole set
- A pelvis that stays still as the heels alternate
- An alternation pace that grows steadily without the pelvis needing to compensate
- Calves that recover the alternating rhythm quickly if it’s ever lost mid-set
A pelvis that never rocks during the alternation matters more than how fast the heels move.
Muscles Worked
- Gastrocnemius (a calf muscle, driving the alternating heel drop and lift)
- Soleus (a deeper calf muscle beneath the gastrocnemius, driving the alternating heel drop and lift)
- Biceps Femoris (a muscle at the back of the thigh, helping hold the legs pressed out against the springs)
- Rectus Femoris (one of the quadriceps at the front of the thigh, keeping both knees extended while the heels alternate)
- Tibialis Anterior (a muscle along the front of the shin, drawing the toes toward the shin as each heel drops)
FAQ
Why does the carriage stay still during this exercise? The whole point is isolating the alternating heel movement to the ankles and calves. If the carriage moved along with the heels, the exercise would stop training that isolated ankle control and become a version of the standard Footwork press instead.
Why is this usually done right after the Footwork series? The carriage is already held out and the legs are already warmed up from the presses, so continuing straight into the alternating heel pattern uses that same position as a natural cool-down transition.
Is some calf fatigue after this exercise normal? Yes, fatigue through both calves after a full set of alternating pulses is expected. A sharp, localized pain in the Achilles or calf is a different matter, worth easing off for and mentioning to a doctor or physical therapist if it continues.
Is a slower pace acceptable if the full alternation feels too fast? Yes, a slower pace is a reasonable way to build the pattern before reaching for the full tempo, and Running — Slow Alternation is built that way.
How often should Running be practiced? Two to three times a week, directly after the Footwork series in a broader reformer routine, suits most people building this ankle isolation.
Related to Running — Slow Alternation as the easier version performed at a slower pace and Running — Faster Tempo as the harder version performed at a near-jogging rhythm.