At home you can accomplish so much and no, you don't need a bow flex or treadmill.
Do a HIIT circuit and if you're lucky and have smal dumbbells or bands then it'll be enhanced but you can do everything body weight and still get a good start on this snow day.
Try a body weight movement circuits such as 20 reps of each, resting 1-2 minutes after each full rotation
- Jumping jacks
- Pop squats
- Stationary lunges
- Push-ups (modified to your capability)
- Sit ups
- Plank 30-60 seconds
- Switch lunges
- Side planks
- Jump squats
If you have a jump rope that can be an element of a good cardio output.
Running in place is a good warm up as well.