• If your chest doesn't touch the floor, it's not a full rep.
• If your elbow flairs out, you're cheating.
• If your core sags, you're compensating.
• If you use your other hand for support, you're modifying.

For a "true" one-arm push-up you'll have your feet about shoulder-width apart, your elbows will be tucked in, and there will be little-to-no sagging through your hips. Your opposite arm shouldn't touch any part of your body and your chest should touch the floor.

One-Arm Push-Up – Correct Form

If you follow the rules, it's not easy. If you contort your body in a way that allows you to cheat... then it'll look like how most people do it, which isn't super hard but it isn't super impressive either. Also, if you have any lower back issues, this exercise isn't for you.

One-Arm Push-Up – Bad Form

Here's what it looks like when you cheat. My hips aren't level, I'm using momentum, one side of my body is coming up before the other, and I'm using my other hand for support. A lot of people do it like this and think they've mastered the exercise. Nope.

If you want to start training the strict one-arm push-up, you should be able to rep out 20 regular push-ups first. This involves keeping your elbows tucked, your core tight, and getting your chest to the floor.

Once you can do this, use the progressions below to develop your upper-body strength and core stability.

Archer Push-Up

This is a great way to learn strict one-arm push-ups. It works because it forces you to tuck your elbow into your side and allows you to absorb most of your bodyweight with one arm. Your other arm will be able to get past the sticking points that make the one-arm push-up so hard. Once you can do five of these on each side, progress to fingertip archer push-ups.

Fingertip Archer Push-Up

This will force you to use your pushing arm more than regular archer push-ups. You can only assist so much with your fingertips, so gradually removing a finger as you do this will mean you're absorbing more and more of your bodyweight.

Once you get down to one or two fingers on your assistance hand, start practicing the one-arm push-up with support.

Supported One-Arm Push-Up

This variation will take the longest to get. At first you'll notice your hips sagging and your body won't come up evenly. Practicing anti-rotation core movements such as the Pallof press, and anti-extension core movements such as the ab rollout and hollow-body hold, will greatly improve your core stiffness and lead to a better-looking supported one-arm push-up.

Once you can do one or two strict, supported one-arm push-ups, you'll be ready to lose the supporting arm and nail your strict one-arm push-up.