Not sure whether you people will find this interesting or not, but something i thought i should share. I train every day, with Mondays being my rest days. Yesterday, i training with a heart rate monitor (chest strap and watch). Now, to find out your maximum heart rate, all you do is simply do 220 - your age = MHR So for me: 220-18 = MHR of 202 beats per minute. During a game of singles during training yesterday, my hear rate went up to 185, just 17 beats away from my maximum heart rate. Also, another observation that i made was during a long rally (of around 40 seconds or so), my heart rate went up from 144 to an amazing 175. 175-144 = 31! My heart rate went up 31 beats in the space of 40 seconds. This just goes to show the physical demands on the body. Perhaps if any of you can do this, share with us your max. heart rate, and the rate you experienced during a game, it would be good to see!