It can be hard to keep kids active in the winter. Kids can still get moving outside in pretty cold temperatures, but in many states the temperature can get dangerously low.
Homeschool kids can still get their physical education time in through other ways, though. There are lots of fun ways to keep kids moving and active during this type of weather. Many of these are also good options when it's too hot to get outside, too, or just rainy and miserable for days on end.
This is just the tip of the iceberg, too. Feel free to leave additional suggestions in the comments!