I've incorporated swimming during the week while my knee gets better as well as biking. Something that would really bug me was losing count of the laps I was swimming.. I have the memory of a goldfish lol so I tried timing myself with my iPhone (leaving it wrapped in my towel) jumping out of the pool and typing in the laps.. this only worked for so long. And I didn't want to keep taking my phone to the pool. I searched and searched and found this little itty-bitty mini-garmin haha for swimming. I don't regret the $30.
-It counts my laps every time I clicked it with my thumb
-It's small enough to put on your finger and forget it's there
-It keeps track of your overall time, Fastest/Slowest lap
-Spits out your average lap time too
-for $30, it does it's job well
Like I said, a mini-garmin haha :-)
So if you like to swim.. and are like me and my horrible memory.. I really recommend this little device. I can't swim without it now lol