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The amount of sweat has little to do with how hard your working. Not everybody will sweat during exercise.
the talk test is a simple guide, if you are unable to comfortably talk or whistle while exercising it is more likely that you are working anaerobically and at a higher level than needed for effective aerobic training. the more aerobically fit you are the more you can push it. max HR depends on the individual, and their fitness level, the chart on the machines is only a guide.
when working at an anaerobic level lactate concentrations increase and energy can no longer be provided fast enough via aerobic metabolism.
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