The price of fitness - How do I get better value?

+1 to rowing - but it is a bit more of a lifestyle choice than a hobby. (Ergs are evil though - much rather cycle than erg).

+1 on this, Though you get out what you put in. I used to row a lot more causally last year (twice a week), but ramped it up over winter. I row in a pair and we've won both head races we've entered which is a nice reward. It is a real time sink in the evenings though. At weekends we do 8-10, so you're done by lunchtime so plenty of weekend left.

Really can't argue with the fitness though, I feel so much fitter when playing tennis, or on my bike that I used to when I just did road cycling.