As a 🏀 player I use a double sweatband on mine but if I don't set the fitness app going I find it won't pick up my exercise! Weird. Last night I did 90 minutes of bball and it registered 9 minutes 🤷‍♂️. My heart was up to 150 at its peak though. I wonder if it doesn't like being tight to my wrist? Anyone else had this?