This along with the chest press is often considered the ultimate "guy move" but not only do deadlifts work your hamstrings and low back like nothing else can, they have an added benefit for girls in that they help strengthen your pelvic floor. Take it from a girl who's had 5 kids: you want to do this. Stand with feet hip width apart in front of a loaded bar (don't be afraid to put heavy weights on that thing!). Grip the bar and keeping it close to your body, stand up. Good form is super important with this move so you don't get injured. Check out this video to see the whole range of motion or ask a personal trainer for help. Dude tip: Keep your chest and head up!