SEVERAL OF the punchbags are being tormented, a proud grandfather sits watching, as do a couple of school kids, mentally absorbing punches and movements. In the ring the former WBO super featherweight champion Alex Arthur is sparring with Gary McMillan, who will fight at the Kelvin Hall on Friday and insists he will be British welterweight champion within the coming year. Up-and-coming amateur fighters punish themselves with gruelling regimes and all the time the thrum of the speed ball being pummelled competes with the bleeper which sounds every three minutes. Days here are measured in rounds rather than minutes and hours.