A pool workout I used to do was this:
Swim 100m, jump out. Do 20 pushups.
Swim another 100m, jump out. Do 25 situps.
Rinse and repeat until you have done 1000m. Work up to do 2000m and eventually 3000m.
2014 BMW X3 xDrive35i M-Sport
Alpine White w/ Black Nevada/Brushed Aluminum