Got out had do do intervals. I was supposed to do 2 rides with 3 20min int total but ended up doing all 3 together for 2.5 hour ride. No real hills around so I used the wind to help simulate. Not perfect but it helped. the last 5 miles was really nice with wind at my back. Sigma HR computer fritzed out with 10 miles to go probably batteries again 48 hours battery life span or 3 batteries 1chest1forks 1display each month , it could be the cold a little bit . But my cateye hasn't gone dead in 2 years of riding 3 years total. I just know I'll be selling off to some poor sap at a heavy discount when I start working again.