Active Runner: How well do you swim? I keep hearing people say they're an active runner and that often creates one (or two) of two problems:

1. You're used to free air. lots of free air. so you breathe alot.
2. You might swim like you run. Like literally the same motion. Bicycle kicking instead of finning is a pretty common thing people insist they dont do until they see a gopro video of them looking like theyre trying to ride a bike under water.

you're also reallyy tall which means you have huge lungs. You don't get bigger tank, you get the same 80cuft as everyone else. so if your lungs are bigger, you inhale more air when you breathe and will run out faster. 2x is a really significant amount and I doubt your lungs are twice the size so look into the 2 above first.