The spider crunch is a core exercise that begins in a straight-arm plank position and involves raising one knee toward your same-side elbow to target the obliques. It is similar to a mountain climber, but with the knees out wider. It can be performed for time or reps as bodyweight ab training or conditioning.
Builds core strength and stability
Serious cardiovascular challenge and calorie burn
Teaches core to brace while upper and lower body move