Here is a great, leg-day routine. Perfect for when you have limited time but you want a killer workout. I threw a few abs in just for fun.

 Complete the following for 30 minutes with 1-minute rest in between rounds:

10 Weighted Squats

10 Step-ups each leg, with weights

10 Stiff-legged dead lifts, with weights

10 Jump squats

100 Sit ups

10×10 Decline crunch with ball