[noodle]

I was wondering, what sports are popular over in japan and are easy to get into. For example here in paris, i stay fit(ish) by playing basketball at the local parks... no need to pay, just go whenever i want etc...

Is this the case in japan? are there parks for basketball/football etc!! if not..... how much does a gym membership cost on average?

all above questions are designated to cities only, ie, tokyo/osaka/kyoto...