re: tendinitis. I make absolutely sure my elbows and knees are warm enough before I go for a ride. I'm usually out the door and on my bike not long after I wake up so my blood hasn't really got a chance to circulate and warm up my tendons yet. There were a few rides earlier in the winter where my elbow tendons and knees really started to ache so now I just deal with being all sweaty when I get to work. I don't have too much of a problem with frozen lungs though...