How much did we spend? Very little in comparison to the amount of benefit we get from riding--less than 10k but more than 2k.

How much exercise? Not nearly enough. We're working up to 100+ miles per week on the tandem. On off days, we occasionally break out the Total Gym for some strength training. We also walk quite a bit, but count that as transportation rather than exercise.

Just tandem? No, we also ride half-bikes on short distances or for transportation, i.e. a trip to the store toting a trailer, or when we worry about the tandem not being safe, i.e. concert in the park where we can't keep the bike with us.

How old? Old enough to know better, but young enough to still make the attempt! About the same age as TG...

How much fun do we have? LOTS.

Cheers!