TRX mountain climber ("Mountain climbers" Core/total body strengthening, with TRX)

Kneel down in front of the lengthened TRX straps and hook your feet into the handles.
Place your palms on the floor underneath your shoulders and lift your knees up.
You should have a straight line from your head to your feet.
Keeping your body in a straight line, bend one knee in towards your chest.
As you straighten this leg back out, bend the other knee in.
Continue this motion as though you are running.