I’ve hobbled together my own 10-minute ab routine and thought I’d share with y’all, because I’m a giver!
I do 20 repetitions of each exercise described below, repeated twice.
ONE-MINUTE WARM-UP
Flat Floor Crunches: Regular old sit-ups on the floor or a mat. I like to put the balance ball between my legs and press up just enough to touch the ball, working upper abs.
Balance Ball Pikes: This move is a bit tricky. Start in a push-up position with your feet on the balance ball, then suqeeze with the lower abs until your body makes a triangle with your butt at the top.
Balance Ball Crunches: Sit on the balance ball and crunch using lower abs
Side-to-sides: Lie flat just like a regular sit up, except you move to the side — touching your fingers to your ankle. Basically, take your right hand towards your right foot, touch the heel and then do the other side keeping your and upper back just above the floor.
Bicycles: At least one minute at the tail end of the routine. 
Boom — your abs are WORKED. 10 minutes, flat.
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