Bow Extension...

Hold a dumbbell in both hands above your right shoulder and point your left foot out to the side (a). In one motion, draw your elbows down to lower the weight as you bend your left knee toward your chest (b). Reverse the movement to return to start. That's one rep. Do 10, then switch sides and repeat.

(Just to be honest - I have not tried these yet!  I threw my back out last week and I still can’t do any ab work, and I am getting mad with a bit of flab!  I can do limited arm work and I am taking it easy on my runs)