I bought my youngest a chin-up or pull up bar that goes in the door frame and she can hang, swing, flip, or do chinups/pullups with it. I found one on clearance for $4.80 but these ones generally run about $10. After today I do NOT want to be outside for much of anything unless it is above freezing.
ETA - My daughter's lungs can't handle extremely cold air and today ended up being painful on her.
ETA - My daughter's lungs can't handle extremely cold air and today ended up being painful on her.