A dynamic core movement from a plank where both legs swing side to side together like a pendulum, staying suspended in the air without touching down — trains obliques and hip control under continuous tension.
Demo: Sundried (reference)
Sets
3
Reps
10-12 per side
Rest
1 min
Contraindications
Shoulder instability — reduce range of motion.Setup
Feet together in the foot cradles at mid-calf, hands under shoulders in a strong plank.
Execution
- 1Brace the core in a solid plank
- 2Swing both legs together to one side, keeping them off the ground
- 3Swing back through center to the other side in a controlled pendulum motion
- 4Keep the upper body stable throughout, letting only the hips/legs move
Key cues
- Upper body stays quiet — only the lower body swings
- Keep the legs together throughout the swing
- Control the pendulum, don't let momentum take over
- Keep feet off the floor for the entire set
Common faults
- Letting the shoulders rock side to side with the legs
- Feet touching the ground between reps
- Swinging too fast and losing control
- Reduced range of motion to make it easier
Tweaks
- Slow the tempo significantly for more time under tension
- Reduce range of motion to regress
- Combine with a mountain climber circuit
Regressions
Muscles
Primary: Obliques, Rectus Abdominis
Secondary: Shoulders, Hip Flexors
Notes
TRX-specific. Angle = intensity: the more horizontal the body relative to the floor, the harder pressing/pulling/plank-style TRX moves become. For pulling movements (rows, face pulls), walking feet toward the anchor and leaning back further increases load. For pressing movements (push-ups, chest press), walking feet away from the anchor and standing more upright decreases load; moving feet closer to directly under the anchor point increases load. Foot position in the straps (heel vs. midfoot vs. toe) also changes leverage and load for lower-body moves. Swing range and tempo are the intensity levers for the pendulum — a wider, slower-controlled swing is significantly harder than a small, fast one.
Sources
- Suspension Trainer Ab Exercises — Sundried (Pendulum Swings among ab moves)
- 100 Exercises with TRX Part 1 — Abdominals (includes Pendulum in comprehensive list)
Attribution: TRX Training