It's funny you guys posted this, because lately I've been asking myself the same question...I was beginning to notice myself getting dumb tired, for no reason. Now I weigh about 230, but I'm in descent shape...I'm telling you guys during a church service I get the total package...
Muscle crampage
Out of breath
physical fatigue
and it stinks, I've been trying to figure out a solution other than exercise as well, I'm ready to just play a whole service without feeling like I just ran a gauntlet