I was sick for two weeks with the whole sore throat, head cold, chest cough thing. How long before I get back on the bike. I tries riding yesterday...5 miles and I was through, coughing, gasping for air and heart rate up. Today the muscles are tight and sore. I usually ride between 20-40 miles and feel great! How long before I'm back to normal? Should I just push ahead or take it easy?