A short and personal list of Innovative and inventive products in the world of fitness, not in any particular order! ​ #1 Concept2 Rowing machine. Developed by brothers Dick and Pete Dreissigacker, the ‘erg’ is a compact, useful way of training both for rowing and for general fitness. In the UK leveraged the celebrity endorsement of Steve Redgrave to promote and sell. Proved that a machine could exist in the gym and at home and was genuinely effective. #2 Exercise classes. Fr