Get a babysitting gig and then take them to the park so you can play on the jungle gym
There are those silly signs on most NYC playgrounds that you cannot enter the playground area as an adult without a child, but no one said you can't accept a babysitting job just so you can take them to the park and play on the jungle gym yourself. You can do a pretty serious strength training circuit and get paid at the same time? What, the kids basically entertain themselves right?
[Photo via @babymeetscity]