I always struggle with Janathon on rest days, nothing to do, what to do. I started with a plank (1 minute). But I always do that now, so it doesn't count.
Last week I was going to tidy the garden, but I ran out of hours in the day (always happens). So today I tidied the garden. Moved lots of dirty pots to empty them, moved the table and chairs, shifted the kids' toys that have ruined the weed patch (known as a "lawn" to some people), and cleared the leaves and dead stuff I should have cleared in autumn. Lazy me. But the hour exertion was worth it.