You have to sit up straight ... to demonstrate an exercise you can do for your upper body it’s also going to work your lower body. And that would be a pushup You take the ball and put it ...

One in particular left its mark on me—the corkscrew exercise. It involved lying on my back ... In fact, I'd wager a few reps of the Pilates corkscrew move would be better than hammering out dozens of ...

So sit on your ball. Take a minute ... Well done, 10-minute stability ball exercise. Now don't forget to cool down and stretch it out a little bit, all right? Have a great day.

Bored of planks and crunches? Why not try mixing things up with a killer ab exercise that targets most of the muscles in your mid-section? The zombie sit-up isn’t for the faint of heart ...