I agree with both of you. Running hills builds strength and is a fantastic workout, but you need to work into them. We don't have hills here in South Florida, so I run bridges. My new after work workout has an optional bridge. I have had some sore calves the last couple of weeks when I started turning up the intensity on the bridge. I have since turned down the intensity and will work my way back up once the soreness is gone.
Ah to be a Master's Runner!
"God gave you your body as a gift, so you should take care of it." - My Mom