Been reviewing home workout videos for a while now and there's one mistake I see constantly: people film themselves from the front, then wonder why their coach can't tell if they're hitting depth or letting their knees cave.

Front-on video hides your hip crease. It hides your lower back rounding. It hides literally the two things that cause most knee and back injuries in squats.

If you only fix one thing about how you record your training, make it this: film from the side. Prop your phone against a wall, step back far enough to get your full body in frame, and make sure the light source is in front of you, not behind.

Side angle shows you (or whoever's reviewing your form):

• Actual squat depth vs. hip crease below the knee

• Whether your knees are tracking over your toes or caving in

• Whether your lower back rounds under load

• Bar path / hand path on presses and rows

You don't need a gym, a rack, or fancy equipment to train safely at home — a resistance band and a patch of floor is enough. But you do need footage that actually shows what's happening. Fix the angle, and you (or your coach) can fix everything else.