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: It is better to do 5 slow, perfect reps than 20 fast ones with poor form.

: Start in a high plank. Alternately tap your knees to the floor lightly to engage the lower abdominals without losing your spinal alignment. : It is better to do 5 slow,

: Exhale on the "effort" phase (the crunch or the lift) to deepen the abdominal engagement. : It is better to do 5 slow,