The iHealth Edge measures activities with great accuracy when the wrist plays a key part in the movement, and when the feet are in contact with the ground (walking, running).
The iHealth Edge has more difficulties recording data for activities that involve resistance, such as bodybuilding, yoga and cycling. The iHealth Edge still captures data if it is worn during these kinds of activities, but the movements involved are not recorded as precisely as they are during activities like walking or running.
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/210742809-iHealth-Edge-AM3S-Activities-supported-by-the-iHealth-Edge