Officials working for the National Biking Association have made different claims about how Jordan Jones won the American Cycling Classic this year. Right now, which claim do you think is the strongest? Claim 1: Jordan Jones increased his cellular respiration and improved his performance by blood doping.
Claim 2: Jordan Jones increased his cellular respiration and improved his performance by changing his pre-race meal.

Claim 3: Jordan Jones increased his cellular respiration and improved his performance by training at a higher altitude.
Why do you think that claim is the strongest?