I'm not sure if I have a problem here or if it's just getting older that causes this to happen. I am able to cycle 10 to 15 miles one day without any problems, but if I try to do this the following day, then I'm just lathergic and don't have it in me to do it at all. After a couple of days rest I'm raring to go again without any problems. Could this just be down to my age? I'm 53 yrs old now and it's been like this for a while now.