Trust me, all that working out will stand for something even if they find something. My husband was always very physically fit. When he was diagnosed with bone cancer he was able to tolerate the hard treatments, and still continue to do well. He is in his 70s, and still way ahead of most with his disease, we attribute much of that to workouts, marathons, etc. even though he has been unable to do continue it after diagnosis. Walking is his friend now.