Installing a swingset/play area

[JERRY2KONE]

How about laying a pressure treated four by six into the ground with holes drilled into it for the poles to sit right into. The four by six laid into the ground will give you stability, and having the swing set poles set into the holes will give you the mobility to remove the set easily. If need be you could also run bolts through each leg to keep it in the four by six. Sounds pretty solid to me.