Shauk, that's a difference in fitness when you're watching others. They've trained to be able to do that. Just because you're a big guy doesn't immediately mean that you'd be able to do the same. Just because I used to be a runner doesn't mean that I can either. You kind of have to "earn" it.
And body type rarely has much to do with resting heart rate and more to do with how efficiently your heart can pump blood around your body. Really good endurance athletes typically have a slightly larger heart than the norm (note: not enlarged, just naturally larger). You could have a slightly smaller heart for your body type than the norm, which is going to result in a higher resting heart rate.
And resting and max heart rate are directly linked, by the way. The little charts on the machines are for the center of the bell curve, and not necessarily everyone is going to fit the chart.
So, 1000 words later, here's my point. Stop worrying about other folks and what the machines are telling you, at least until you develop a decent fitness level. That's when you'll be able to tell what it really means.
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