Popsugar Fitness Workouts 12 Days of Fit-mas Videos From Constantly Varied Gear Have a Merry Fit-mas With These 12 Days of Fit-mas Fitness Challenges December 21, 2021 by Jenny Sugar View On One Page Photo 6 of 9 ADVERTISEMENT () Start Slideshow View this post on Instagram A post shared by Constantly Varied Gear™ (@constantly_varied_gear) Share This Link Copy ← Use Arrow Keys → 6 12 Days of Fit-mas Fitness Challenge: Day 6 Try this fast-paced core challenge doing these single-leg crunch variations — how long can you do it for? Previous Next Start Slideshow WorkoutsHoliday