Sunning while biking

Outside in the driveway and facing the sun, better than the basement for the trainer. Should've gotten up earlier to go ride on the road, but didn't happen and with the kids home from school, it's just too hard to pick up and go. WOD was 4 x 5 minutes on 2 off, for distance. 1st- 2.18miles, 2nd - 2.36, 3rd - 3.39, 4th -2.45. Was on the highest gear and couldn't turn up the resistance anymore. Heartrate in the 170s. Cadence was between 80-90.