Some crossfit boxes have scaled down bodyweight only exercise classes that allow kids attending with their parents to participate in for no additional charge. Many of them have a punch card system where you can get 10 classes for $100 but often during promotional drives you can find these deals at a discount. Granted you can get a 1 year membership at many 24 hour fitness places for $100 but there isn’t the same encouraging community atmosphere like at a crossfit box. The reason I bring up the punch card deal is you can work out at home during the week and hit the crossfit box on Saturdays. This would give you 2-1/2 months to decide which is more right for you and your family.