Grip strength is the number I check first

Every session starts with grip, both hands, best of two. It takes thirty seconds and it is the most honest number we collect.

What it shows

Grip drops when you slept badly, flew, or are getting ill, often a day before you feel it. A drop of more than ten percent against your average and we train lighter that day.

What it does not show

It is not a measure of how strong you are overall. It is a daily check, like a pulse, and it only means something next to your own past numbers.