If you celebrate Christmas, it is probably a good idea to get a ride in at some point. The cookie intake will be extremely high today. Try this one:
Warm up for 10 minutes. Then do 8 minutes high cadence (105+) followed by 8 minutes low cadence (50-55). Repeat 2 times for a total of 3 sets. No rest between intervals. Alternate sitting and standing during the low cadence work to add variety. My heart rate is usually high zone 3 to low zone 4 on these (6-7 on a 1-10 scale). Cool down for 10 minutes.
Enjoy the holidays, mb