Who: The Doctor and Handy
When: Before the Doctor's conversation with Rose.
Where: The pool.
What: The Doctor and Handy discover a few things about themselves.
The Doctor came out of the locker room wearing bright yellow swim trunks (provided by the hotel, of course) and a towel slung over his shoulder. When he'd noticed that his lack of running and a great increase of reading and biscuits had led to a few extra pounds, he decided to make time for exercising, before his suit got tight. Swimming seemed a good way start.
Goggles on, he dove in and began swimming laps across the pool.