"50 is too young for last effort, just start slowly practising movements that focus on arms, shoulders, stomach and legs," Hassan Abdul Salim tells an elderly-looking man whom I later learnt is the chief finance officer at one of Kenya's five-star hotels.
Nearby, two women are gasping for breath after taking turns to land a round of 150 uppercuts [a punch delivered upward with an arm bent] and triple jabs on Mr Salim's black Puma boxing pads.
