I recently got all set up to begin my new hobby of road cycling, i was pretty excited about going on my first ride and really wanted to push myself. I realized soon after that i probablly should have gone in a little bit slower. I did about 75km in 3hrs in 10 celsius which probablly dropped to 5 celsius for the last hour of my ride. When i got home i was exhausted and my chest, lungs, throat (everything to do with breathing) were burning and continued to bother me for the next couple days. Its 3 days later and i am feeling a bit better, i cant wait to get back out there, however i want to progress without hurting myself. I guess my question is: how do I establish challanging goals for myself without seriously hurting myself.