What is a sensible starting dose for the TRX hamstring runner, and what should you master first?

Master the two-leg TRX hamstring curl with a rock-solid, level bridge before trying this alternating version. Start with 2 sets of 6 to 8 alternating reps per leg, and stop the set the moment the hips start dropping instead of pushing through.

What can you do instead of the TRX hamstring runner if you don't have a suspension trainer?

A stability ball hamstring curl trains a similar bridge-and-curl pattern if a ball is available. With no equipment at all, a single-leg glute bridge with the free leg held straight out builds comparable single-leg hamstring and hip control.

What is the TRX hamstring runner good for, and when should you skip it?

It builds advanced posterior-chain and single-leg hamstring resilience that carries over to running and sprinting. Skip it if you can't yet hold a level bridge on the two-leg version, or as an early-session move before the hamstrings are warm.

Advanced

TRX Hamstring Runner

Holding a bridge with both heels in the cradles, you curl one heel toward your glutes while the other extends, so each hamstring works alternately near a single-leg load. That reciprocal action, done while the hips stay lifted, makes it a demanding step up from the standard two-leg TRX curl. Program it for advanced posterior-chain work and single-leg hamstring resilience.

Equipment: TRX
Body part: Glutes, Hamstring
Type: Strength
Browse by muscle: Biceps Femoris, Semitendinosus
Browse by movement: Knee Flexion

How to do it

1
Lie on your back and set both heels into the foot cradles with the straps short.
2
Extend the legs and press through the heels to lift the hips into a bridge.
3
Brace the core and keep the hips high and level throughout.
4
Curl one heel toward your glutes while the other leg stays long.
5
Reverse smoothly, extending the working leg as you curl the other in.
6
Continue alternating in a controlled running rhythm without dropping the hips.

Tips

Keep the hips lifted the entire set; a sagging bridge switches off the hamstrings.
Keep both hips level so one side does not hike up.
Control the tempo rather than letting the straps swing your legs.
Master the two-leg TRX hamstring curl before attempting this alternating version.

Variations

Common mistakes

The working foot slides onto the ball of the foot instead of staying on the heel, shifting the pull from the hamstring onto the calf.
The extended leg snaps into a hard, locked-out knee at the far point of the stride, loading the joint instead of the hamstring.
The head tips back to watch the ceiling, which arches the neck and breaks the straight line of the bridge.
The pelvis rotates side to side to help the working leg curl in, turning a straight hip hinge into a twist the hamstrings don't need.

Frequently asked

What is a sensible starting dose for the TRX hamstring runner, and what should you master first?: Master the two-leg TRX hamstring curl with a rock-solid, level bridge before trying this alternating version. Start with 2 sets of 6 to 8 alternating reps per leg, and stop the set the moment the hips start dropping instead of pushing through.
What can you do instead of the TRX hamstring runner if you don't have a suspension trainer?: A stability ball hamstring curl trains a similar bridge-and-curl pattern if a ball is available. With no equipment at all, a single-leg glute bridge with the free leg held straight out builds comparable single-leg hamstring and hip control.
What is the TRX hamstring runner good for, and when should you skip it?: It builds advanced posterior-chain and single-leg hamstring resilience that carries over to running and sprinting. Skip it if you can't yet hold a level bridge on the two-leg version, or as an early-session move before the hamstrings are warm.

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