It's true: You don't need fancy weights or expensive gym equipment to drop pounds and build muscle. In fact, all you need is your own body, sheer determination, and an aggressive routine like this one.

After 12 rounds of this punishing circuit—which is stacked with high knees, kettlelbell squats, pushup to side planks, and broad jumps—you'll have taken the first (and probably most important) of many steps toward your ultimate weight loss goal.

One thing to keep in mind, however, is that this workout isn't for guys who are used to quitting. (And if you are, then maybe it's time to break your old habits with this workout.)

Directions

You'll do this workout as a circuit, meaning you'll complete each exercise consecutively without rest. Once you've finished all exercises, rest for 30 seconds. Repeat the entire circuit for 12 rounds.

Depending upon your ability, you may shorten or lengthen the rest period. You may also complete more or fewer rounds.