Commanders players take part in practice outside London on Wednesday. (Alastair Grant/AP)Sure, NFL players are bigger, faster and stronger than the rest of us. And they can brush off the physicality and pain that comes with playing professional football.But when it comes to going straight to work after traveling overnight on a seven-hour, 3,000-mile flight across the pond, fatigue hits you no matter how much you can bench press or squat.“I'm tir…