The heat can be good or bad, i rode in 112 heat in Scottsdale AZ, no problem..just stay hydratedBack on the bike today after some minor handlebar tweaks and seat post height adjustment. Road 12 miles in a bit over an hour. In the 90's and very humid today. I was try to keep my heart rate down in the 130's, but it wasn't happening in this heat. I slowed my speed and dropped my cadence down a bit, but I still had to do some coasting to recover some. Average HR was 137 for my ride. Average cadence 76. I need to re-read my books on Heart rate training and cycling over 50.