Answer :
The strongest claim is the claim that; "Jordan Jones increased his cellular respiration and improved his performance by training at a higher altitude."
Cycling a very popular sport especially in the united states. There are now many cycling federations that carry out cycling events around the world thereby popularizing the sport.
It is common that people who participate in athletic games practice at high altitudes. Hence, the strongest claim is the claim that; "Jordan Jones increased his cellular respiration and improved his performance by training at a higher altitude."
Learn more about cycling: https://brainly.com/question/2027040