Having tried 'aerobics', studying the course myself (passing the written exam but not taking the practical) and prior to that attending courses, I've found that many people my age group (54), also younger and also older but still active have various knee, hip, back problems etc that seem to be aggravated by the exercises, but there doesn't seem to be much in the way of alternatives unless they attend a gym (boring).

I live in a village and I know for sure that some of the villagers would love to have an activity apart from walking or badminton which they could attend locally as many of them still work and their time is precious. I walk, do stretches at home and have recently started teaching chair based exercises, but there is definitely a gap for the middle age group with little time to spare, which is active but doesn't add injury to our delicate bodies.