Overseas, way back I use to have a physician who specialized in athletic performance, among also treating general health patients.
Quarterly exams included blood tests, nutrition analysis, EKG on a bike, heart X-Ray, Lung X-Ray, general health and sports specific analysis with advice or assistance as needed.
Find it hard to get this in the US, all Sport physicians in my town treat either specific conditions, or injuries. My family physician is not much help.
What do others do?
Hire a coach with a brain. Try to find a doctor who does sports.
Old Road Racer
Obsess about training and physical metrics that don't require a physician or medical test equipment.