I'd use it to run, do workout tapes, practice yoga or go hike/ walk with the dog.

READ! I don't seem to have enough time to read anymore, and my book list is longer than my arm. I keep adding new books, but not any time to read them!

Probably nothing, if I'm honest. I don't do much with my time now, so I don't see the odds of me doing better with more time being very high :-(

Sleep. I never get enough sleep.

Reading too.

I'd like to sleep or read, but I'd probably clean or paint (walls, not paintings).

Time machine maintenance.

Read or sleep, yes.

Yeah, I'm not a busy person and I get plenty of sleep so I would just do more of the same: Eat, drink, read, pet cats, watch junk, drink.

Guitar. Always.

I'd probably waste it reading the Internet or sleeping, or maybe entertaining the kitties. I should spend it cooking healthy meals or exercising.

I would love to have more talking time with my husband. We are usually so tired from work and twin babies that we zone out in front of the tv or go to bed immediately at the end of the day and it would be nice to have more time to talk like real people. I hope I wouldn't waste it on more internet surfing but I prob would.

sleep.
sleep is never a waste of time.

Some kind of exercise, because if was anything else I'd want either more than an hour or be fretting about how much time was left too much to enjoy it.

It could be great, like a time out of time where you get to leave whatever else is going on, so in the middle of something stressful, you could just go take a walk and have a breather, or before you have to get into your day, you could have a set workout to get active and ready, or transitioning from one thing to another, etc.
I imagine you know when it will be and get to slip out of your time stream and back seamlessly.