Man, I hope you don't captain a ship... you know those "loose lips" could be a hazard. I just did a 2 hour rehearsal using a total of 7 mouthpieces over that time, and I feel Marvelous baby! Keeping continual pressure off the same pressure points of the lip also helps minimize fatigue, which is why weight lifters vary the weights they use in a work out. No reason why this cannot work for a "trumpet work out". I am finding it a bit difficult doing warm down push-ups with my lips and I strongly recommend avoiding this practice, just saying!