Dumbbell squat
How to do it: Begin to raise your torso as you exhale by pushing the floor with the heel of your foot mainly as you straighten the legs again and go back to the starting position.
Why: Squats are an excellent all-round exercise and one of the best moves for building overall strength. Dumbbells let you concentrate on technique and work on your range of movement at low weight. Only advance to barbell squats in the gym once you've got this nailed.