Right off the top I am not a triathlete, due to medical issues I can no longer run but can ride with no issues. I have recently purchased a new to me TT bike and have been playing with fit, I will get a professional fit before summer to make sure I don’t kill myself. I have noticed burning in my quads while on trainer once I get up to my FTP and HR seems to be running higher. Is it just getting use to aero positioning, will admit I’m a Clyde and nelly might be pushing up on diaphragm, I’m working on the belly.