I can't find any online news about this. I suspect that it was such a minor story that it didn't even ping the radar. Anyway, I talked with a woman at 24 Hour Fitness in San Leandro today and she says she was in the pool last Thursday when some guy who was trying to push himself too hard on the treadmill dropped dead. EMTs were called, but they couldn't revive him.
Don't have any more details than that.
Start slow, people! When I started at Curves I got out of breath so easily. Now I can go for ages doing tough stuff. You gotta start slow and work up. Over time your body will adapt to the excercise and you'll have to work harder to push yourself.