Write the next sentence in this paragraph:

How to get hot legs fast
Play a song that is about 3 minutes long.
Do squats for the entire song.
If you want to challenge yourself, hold a medicine ball or any other slightly heavy object.

OPT:
[I] When the song ends, squat and raise the medicine ball (or make sure it's at eye level) over your body. Give a thumbs up to a ref if you're disqualified.;
[II] Start with small (3 to 4 inches in front of the top of your big foot) squats for about a minute then hold a warrior ball in front of your big foot. The music song doesn't have to move, you can do whatever song you like.;
[III] Do squats or ones that start at the bottom, as these are at the least more challenging. Start with your knees, roll your knees, your feet, and your head.;
[IV] Repeat the song, or change it to another 3 minute song. Do calf raises (raise up on your toes and then come down) for the entire song.;
[IV]