I’ve been swimming quite a bit lately, for fitness, and always lose count of lengths done, plus all the pools I go to (I mix it up) are different lengths. I would like a watch that can measure distance swam and various fitness things but that only wear for swimming, so no point wasting money on one that measures my sleep and normal heart rate etc. any recommendations? (I swim less than a mile each time so we’re not talking elite athlete or anything).