Celebrity fitness trailer David Buer leads us in a quick and easy way to keep fit: wall push-ups. Mitt Romney’s Complicated Political Career Comes to an End I’m 54 with a 35-year-old body.

If you’re just getting to grips with push-ups, the wall, rather than the floor, is where you should start. "This approach uses less of your body weight so it’s a great place to start," says ...