I gave up running for fitness the day running guru Jim Fixx died of a heart attack while jogging at the tender young age of 52. Which was sometime after skiing blew out my knees. But the “sport” of running goes on without me. There’s a farrago of GPS running watches to tell you when and where you might pull a muscle, dehydrate and or/drop dead. So which one sucks? The Running Channel’s British reviewers reckon . . .