I’m bringing you two videos today. The first one gives you full instructions on how to engage your core as you do these hamstring-focused lifts. Deadlifts and their many variations are great for toning the backs of your legs, and also really great at teaching you to engage your core as you pick crap up throughout the day. Really, we “deadlift” all day. We pick up kids, laundry baskets, toys, and the list goes on. Watch the instructions, and then jump to the second video to see the circuit workout in action. The first video is worth watching just to see my cute-ass kids lifting their weights like bosses!