Well I've been teaching more than 2 years and have never set homework. When your pupils have 7 lessons a day, with homework potentially from each, the last thing some of them need is a PE homework. I constantly promote community clubs to pupils and to me that is their homework - I would must rather they go and play a game of squash for 30 mins at the local club then spend 30 mins doing a 'PE homework'. The only way PE homework would ever work is in primary school where it can be combined with maths / science - e.g. complete the investigation of heart rate during circuit training.