When doing a strength training exercise, the watch automatically saves the recent weights used which is very convenient when switching between weight. But every weight except zero gets saved. It would be convenient if also the "0 kg" would be saved for easy switching in the recent used weights.
When supersetting two weighted exercises, you can quickly switch between the two recently used weights, but if one of them is a bodyweight exercise you must manually enter "0 kg" every time, decreasing it step by step from the previous weight with first the hundreds and then the singles/tens until you hit zero.
Picture attached as explanation, imagine one of the choices saying "0 Kg".
