New trick for counting

Tonight I went to Masters swim. Swimming involves lots of counting. Things like total yardage, Laps, Lengths, How often you breathe. Strokes per length. and sometimes some many strokes with each hand. We swim lots of laps, tonight we swam 160 lengths in a 25 yard pool. One of the exercises was 10x100. Each 100 yards is 4 lengths of the pool. So you count your lengths and then you rest 15 seconds between each set. Mike the guy I was sharing the lane with put his fins and paddles and float in a line at the end of the lane. After each set he would stack the items next to each other. After we swam 5 sets he started stacking the stuff the other way. It was quick and easy to keep track of how many sets we had swum. The simplest things work the best.