I had 2 close "encounters" with Navy Seals.
1 before going to Iraq. My unit was Artillery, but we were retrained as Infantry before going to Iraq. At one point a group of us was selected to be trained by Seals on close quarter combat and house clearing for 3 days, and when we were done, we would go back and train the rest of the unit. Well, there were 4-5 seals and only one of them looked super fit. 2 were on the slim side and 2 had little beer guts. All of them knew their shyt tho.
The 2nd time, we were actually in Iraq and we received Intel that a pretty major player was operating near our area. Dude was pretty big time. They tasked our unit to go in and get him, but 3 Seals actually lead the mission. We prepped for about 2 hours and did some quick training for about 45 mins before heading out. And again, 2 of these guys had pot bellys and 1 looked like he worked out some, but wasn't big like that ( Dude might have been a farm boy that got toned up when he got to the military now that I think about it). But again, these dudes just moved different.
Its like seeing a regular dude shadow box vs. seeing Mayweather, or Pacman shadow boxing. Dudes were just different.