What's a sensible starting point for the TRX pendulum swing, and what should I already be able to do?

Start with 2 to 3 sets of 6 to 8 swings per side, using a small arc that barely lifts the legs off center. Before trying it at all, you should be able to hold a strong TRX or floor plank for 30 to 45 seconds without the hips sagging, since the swing asks that same plank to survive real side-to-side force.

What can I do instead of the TRX pendulum swing if I don't have a suspension trainer?

A hanging leg raise with a side-to-side swing from a pull-up bar trains a similar oblique-controlled rotation if you have a bar instead of straps. Without either, a plank with slow, small hip taps from side to side builds the same anti-rotation control at a much lower intensity.

What is the TRX pendulum swing good for, and when should I skip it?

It builds rotary and lateral core strength that carries over to twisting and cutting sports, and it demands real plank strength to control the swinging load. Skip it if you cannot yet hold a stable, level plank on the straps, or if your shoulders are already fatigued from other pressing work that day, since the plank position is doing as much work as the obliques.

Advanced

TRX Pendulum Swing

With both feet cradled and legs held together, you sweep the hips from side to side like a pendulum, driving the obliques to control frontal-plane motion while the shoulders stabilize. It builds rotary and lateral core strength that carries over to twisting and cutting sports. This is an advanced drill that demands a strong, stable plank first.

Equipment: TRX
Body part: Abs
Type: Balance, Strength
Browse by muscle: Abdominal External Oblique
Browse by movement: Core Brace, Rotation

How to do it

1
Place both feet in the cradles and press into a high plank on your hands.
2
Keep the legs and feet glued together and the trunk braced.
3
Establish a straight body line with shoulders over the wrists.
4
Swing both legs to one side by rotating from the waist, keeping the shoulders square.
5
Control the swing with the obliques rather than letting the straps carry you.
6
Return to center and swing to the opposite side, moving smoothly.

Tips

Keep the upper body still; the motion comes from the hips and waist.
Start with small arcs and widen the swing only as control improves.
Keep the hips level with the floor so the load stays on the obliques.

Variations

Common mistakes

The shoulders rotate along with the swinging hips instead of staying square over the wrists, spreading the work into the shoulders instead of the obliques.
Letting the straps swing the legs on their own momentum instead of controlling the arc with the obliques defeats the entire point of the drill.
The hips drop toward the floor as the legs swing to one side, tipping the plank instead of staying level and shifting load off the obliques.
Starting with a wide arc before the trunk can control a small one turns the swing into an uncontrolled flail rather than a rotational core drill.
The feet separate as the legs swing, losing the single unit that keeps the movement clean and controlled.
The elbows lock out hard under the shoulders, which is fine at rest but turns rigid the instant the hips start moving, sending shock into the wrists.

Frequently asked

What's a sensible starting point for the TRX pendulum swing, and what should I already be able to do?: Start with 2 to 3 sets of 6 to 8 swings per side, using a small arc that barely lifts the legs off center. Before trying it at all, you should be able to hold a strong TRX or floor plank for 30 to 45 seconds without the hips sagging, since the swing asks that same plank to survive real side-to-side force.
What can I do instead of the TRX pendulum swing if I don't have a suspension trainer?: A hanging leg raise with a side-to-side swing from a pull-up bar trains a similar oblique-controlled rotation if you have a bar instead of straps. Without either, a plank with slow, small hip taps from side to side builds the same anti-rotation control at a much lower intensity.
What is the TRX pendulum swing good for, and when should I skip it?: It builds rotary and lateral core strength that carries over to twisting and cutting sports, and it demands real plank strength to control the swinging load. Skip it if you cannot yet hold a stable, level plank on the straps, or if your shoulders are already fatigued from other pressing work that day, since the plank position is doing as much work as the obliques.

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