If you like yoga, yoga with Adriene on YouTube tends to do monthly challenges so I'm sure she'll have one in January
Grow with Jo is really good! I feel like I'm having a good time rather than feel like I'm working out
Emrickettz on IG is really good and she had a baby recently so her workouts are very well aimed for postpartum. Pretty sure she’s doing a January challenge x
Following, sounds like such a cool idea