The at-home knee test

Check everything you've ever had, anywhere in your body.

Check at least one box, or "None of these."

Stand on one leg with your arms crossed and your eyes closed. Time stops when your other foot touches down or you open your eyes. The timer beeps at 20 seconds, so you can keep your eyes shut.

Enter a time for both legs, from 0 to 20 seconds.

Hold each position as long as you can with good form, up to one minute. Rest a couple of minutes between holds. The timer beeps at 60 seconds.

Enter a time for every hold, from 0 to 60 seconds. Enter 0 if you skipped one.

Face a wall in a half-kneeling lunge. Keeping your front heel down, push your knee forward until it touches the wall. Slide your foot back as far as you can while the knee still touches, then measure from your big toe to the wall.

Enter both measurements in inches, from 0 to 12.

Prop your phone up to film yourself from the front, then do three squat jumps, straight up and down. Watch the video back.

When you jump, do your knees stay in line with your toes?

When you land, is it soft and quiet with your knees bent and over your toes?

Answer both questions.