In a pool, backstroke is fairly easy to get half efficient and you don't have a breathing problem... I'll be buggered if you can't do better than 2:37 min/100 m (12 min for 500 yd).
In a pool, backstroke is fairly easy to get half efficient and you don't have a breathing problem... I'll be buggered if you can't do better than 2:37 min/100 m (12 min for 500 yd).