This I like, plugged into my ear while I lift or box: simple percussion. I tell you that you measure every beat waiting for the rhythm to change.
Today my neighbour's 6 yo kid hung over the fence mesmerised by my exertions under the verandah punching the bag. I had to ignore him, right? Other wise I would have missed my beat(ing).
Focus. Focus. Sweat.
Catch you later, kid...