You don't need to spend hours in the gym each day to score a slim, sexy body. In fact, with this bodyweight circuit created by Jessica Smith, certified personal trainer and author of Thin in 10, you can work almost every muscle in your body without setting foot inside the gym.
How it works: Complete the workout circuit-style, performing each move for the prescribed number of reps and then immediately moving on to the next exercise without rest. After you finish the last move, rest for 1-2 minutes and then repeat the entire circuit 1-2 more times, depending on how much time (and energy) you have.
Bonus tip: Do this workout barefoot to fully engage your muscles and get even more out of every move.