Question for Mr. Kobren and/or IAHRS Physicians regarding exercise and hair loss

[baldingpittfan]

I'm 32 years with a receding hairline but no loss in the crown thus far. I think Propecia is helping to keep what I have. Here's my question:

I'm 5'10", about 220-230lbs and out of shape. I want to start exercising again but fear that the exercise will build testosterone and thus will accelerate my hairloss. Is this a well-founded fear? Will I lose hair faster by getting back into the gym? Thank you.