Side plank crunches (right)

How to do it

1. Set upSide plank on your forearm, top hand behind your head.
2. MoveBring your top knee and top elbow together in front of you, then extend back out.
3. Watch forHips dropping as the knee comes in. Hold them up the whole time.

Easier or harder

Easier

Side plank dips (right).

Harder

Do it on your hand instead of your forearm.

What it works

Muscles

Core

Position

On your side

Intensity

Moderate Medium

Impact

No jumping

Swap it for

• High plank arm raises
• Bicycle abs
• Slow paused bicycle crunches
• Sit-up + punches
• Regular ol situps
• Starfish crunches