Go Mammoth runs sports leagues across London including Islington:
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basketball; http://www.gomammoth.co.uk/basketball/london/
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5-a-side football; http://www.gomammoth.co.uk/5-a-side-football/london/
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netball; http://www.gomammoth.co.uk/netball/
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and also fitness classes, yoga and boxing; http://www.gomammoth.co.uk/fitness-classes/