> - nearly complete loss of body hair, except on the head (which is consistent with wading) It's also consistent with running. Running creates a lot of energy.

> - nearly complete loss of body hair, except on the head (which is consistent with wading) It's also consistent with running. Running creates a lot of energy. Like a lot. You know when it's sub 10 celsius out and everyone is freezing their butts off? You go for a run in tiny tiny shorts and a tiny little t-shirt and yes it's freezing your nips off but 3 miles later you're sweating balls and wishing the t-shirt was smaller and the shorts even tinier. They say the perfect temperature for a marathon is around 4 celsius. That's because when you're fast enough, heat dissipation is pretty much the only limiting factor to how fast you can run. Even an amateur runner like me can see huuuuuge gains in speed just from running in temperate winter instead of during summer.