As far as I can see, the best option for getting involved in football and sport in Rio. Really friendly, welcoming, good competitive standard without being intimidating, nice mix of locals and foreigners/travellers. And, also, *super* well-organised, which is kind of a boring point but is actually really important - no annoying cancelled games, missing players, bibs, balls, etc. etc., just a reliable, good quality game every time. The atmosphere is nice and chilled but a hell of a lot of solid work goes on behind the scenes to make everything feel so easy for the players. I started playing in AtivoRio's weekly 11-a-side football matches soon after arriving in Rio, and stayed until I left Brazil five months later, so I feel like I can pretty reliably report that this is a great initiative, whether you're in Rio for a short time and want a one-off game, or whether, like me, you're looking for a more long term football fix. They also do great extra stuff like beach sports days and the odd away game if you're interested in that.