purbeast
Contributor
To be fair, you brought up the comparison not anyone else.If you look around, Phelps's body fat is quoted at ~10% with FFMI of 21. Are you sure you want to go into a muscle size contest with that?
Floating is being relaxed and lung size. Yes, your lungs are most likely smaller than those of a swimmer -- or a singer or a wind instrument player. Think of it that way: if you're not wearing a flotation device while snorkeling, the only real difference then is you can breathe through the snorkel at your own relaxed pace and keep your lungs inflated enough to stay afloat at all times.
I just checked FFMI and my current one is 25.2 and that’s being somewhat generous.
When I snorkel my face is facing down and underwater so not really sure what that has to do with anything. And my legs are usually moving.