Muscles worked: abs, obliques, quads, hamstrings, deltoids, biceps, triceps, and the chest.
Start off in the standard push up position. Pull your knees up to your chest, one at a time, in quick succession. You want to keep your body in a push-up position all the way through the exercise, so don't bob your hips up and down as you're tucking your legs in. Do 20 seconds three times.
There's nothing better than a good cup of tea and a good book.
FROM THE ARTICLE
MORE LIKE THIS
The 8 Best Strength-Training Exercises for Beginners
HIIT workouts you can do from the comfort of your own home