Indoor exercise for the Chi

It’s been snow cold, and otherwise yuck here in OH for 2 weeks.
Any exercise suggestion for the 5# Chi who hates cold/snow etc. I’ve been on the dreadmill, but ask me why I was awake at 2 am this morning.

Teach the dog to use the treadmill! A lot of dogs love it! Compared to more active breeds, it would be really easy to teach a small dog to use it safely.