It also has a lot of advantages: - all you need is a pair of decent trainers and shorts - you don't need a partner - you make obvious and steady progress -

It also has a lot of advantages: - all you need is a pair of decent trainers and shorts - you don't need a partner - you make obvious and steady progress - most people unused to exercise need to work on cardiovascular stuff, not six packs - you get to go outside, not stuck inside a hall or somewhere