In today's Scotsman Glenn tells David Ferguson about his injury problems and his hopes for the World Cup.
"Maybe some did, but not me," he says. "There were some pretty hard times, definitely, and I did wonder when it would end, but I never contemplated chucking it."
Glenn's problems began in 2000 when a heel injury hit his New Zealand tour and sparked two years of misery. "My heel injury wasn't the most serious, but it was the niggling start. That affected my pre-season training and then, in the October, I fractured my kneecap. The momentum I'd built up over a couple of years was just gone in one swoop. I was out until the next May, really, but took some time to get fully fit.
"Every rugby player just wants to play rugby and sometimes your heart overrules your head - there were times when I played when I shouldn't have been playing. That wasn't clever, and it added to the frustrations, but, thankfully, that's in the past now."