A reward for losing mass that doesn't cost ANY MONEY?

My husband and I are losing weight, and we've get a compition on who can get to 15 the fastest, afterwards 30, then 50, etc... What can we bet that doesn't cost any money? Or at smallest not MUCH? Cooking dinner
Doing the laundry
Go out to movie
Massages
Foot rubs
Bathing the kids...
thats a great competition to play ariund with...
I don't know....
something similar to..
daily chores or something
I honestly don't know
to be precise an interesting question though
Hugs and kisses