Planned to go on a longer ride, going up Stillwater to Fruitlands, then to Harvard Center, and Oak Hill to train for my ride in Colorado in September. But, there were some looming thunderstorms coming in earlier than expected. So, I turned around on Sugar Road to go up Corn Road, and then I heard some thunderstorms and headed back on Westcott. I could feel a little twinge on my hamstring,and psoas, when I worked going up hills. Tried to get my heart rate up, after getting the low risk diagnosis on Friday from my cardiologist, after the nuclear stress test last Tuesday. Tried to keep it above 123, and get close to or above 143, but it was pretty hard to do that, unless I really sprinted up a hill. On the way home, did a quick loop into the Minuteman ridge neighborhood to get some more hills, and also on the back way up Tuttle from Lothrop.