WHOOP and weight training: what actually interferes

The problem is not the device

In the gym three things degrade the reading, and none of them is electronic: the bar pressing on the device, the wrist bending under load, and the forearm contracting, which lifts the sensor off the skin during the set.

Which is why a nonsensical heart rate during deadlifts says nothing about the quality of your WHOOP.

Bars and handles

As soon as the device sits between your skin and a load, two things happen: it presses, and it shifts. The movements most affected are the bench press, the front squat, pull-ups and anything done with wrists in flexion.

The fix is free: move the band a few centimetres up the forearm. Nothing presses on it any more, the skin there moves less, and the reading becomes usable again. See: where to wear your WHOOP.

Wrist straps and wraps

A wrist strap cinched over the band crushes the weave and restricts local circulation. If you use straps, put the band above them, never underneath.

Fit between sets

The forearm swells under exertion. A band set at rest can become too tight by the end of a session, then too loose once you cool down. A sliding clip adjusts continuously, so you can correct between sets without hunting for the right notch.

What chalk does to a weave

It lodges in it and dries it out. Not serious, but a gym band goes dull faster than another. A rinse in clean water after the session is enough to hold it.

It is a good argument for keeping a band dedicated to training rather than wearing out the one you take to the office. See: how many bands.

The session setup, in short

Band moved up the forearm, half a notch tighter than at rest, above any straps, rinsed after the session. Four moves, nothing to buy.

What to wear under the bar

Three bands that do not move under load: Army, Graphite and the CoreKnit Black mesh, the firmest of the three.

And a fourth, for anyone who would rather it were legible from the next rack: the "No Risk No Story" band, four words in marker pen, red and black. It is the only one in the range that reads across a gym floor.