[header] How to tone up your legs [title] Do squats. [step] Squats are a fundamental leg exercise that can be done at home, and is an important exercise to learn before using leg machines at the gym. Once you've mastered the movements, you can add weights to make it more difficult. 
[substeps] Stand with your feet a little wider than shoulder-width apart. Your hips, knees, and ankles should all be in alignment.