Frog Sit Ups

So you want to work your abs some more? Try Frog Sit Ups. 

Movement:
First, sit on the floor with the soles of your feet touching each other. This will cause your legs to be in a diamond shaped position (maintain this position throughout this exercise). Next, lay down on the floor (onto your back) and TRY and push both soles as near to the crotch as possible. Your upper thighs should optimally be very close to the floor (keep in mind that this is relative and it depends on your individual range of flexibility).  Now, with your hands crossed and touching opposite shoulders or lightly touching your ears, exhale firmly and flatten your lower back to the floor while curling the torso upwards. (Like the first 1/4 movement of a sit up.) Hold at the top position for a two count, if you wish. Slowly lower to the floor or mat, relax the abdomen completely and then repeat.
(This exercise was 'invented' by Vince Gironda.)