How we measure

Kai Muay measures with the phone strapped to the bag. It doesn’t see your fist: it feels how the bag moves when you hit it. Each strike is a peak of acceleration, in g.

We’ve tested it in real sessions, with the strikes counted in advance and with phones from different price ranges.

What it measures

• Strike by strike. In the tests with counted strikes, the app detected every strike: hooks with both hands, knees, low kicks and teeps (the front push kick).
• Whether you landed what the voice called. The voice calls the strike and the side; the app learns your pace in each round and checks that each one landed: what counts is that you land it, not how fast you react.
• Your progress. The power charts only group sessions set up the same way (the same gloves, the phone at the same height, the same bag), so you compare like with like.
• Jump rope. It counts your jumps with the phone on the floor, one step from your feet.

How to read the numbers

• Compare yourself with yourself. The g reading depends on the phone, where it sits on the bag, the bag and the gloves. Your record is yours, on your phone: it isn’t for comparing with someone else’s.
• “≥ 8 g” means “at least”. Many phones read up to 8 g, and a hard strike goes past it. When it can, the app estimates the real strike from the shape of the signal: “≈ 9.5 g”.
• g, not newtons. The g readings compare your strikes with each other, on your bag: that’s what tells you if you’re improving.

We keep measuring, and we’ll add what’s new here.