False. People sweat more or less depending on their fitness level, the humidity, the temperature of their body and the temperature outside the body.

In fact, people who are really fit usually sweat more than unfit people.

1) Can you explain why we perspire when we exercise? How does perspiring help the body during and after a workout?

When the body gets to a certain temperature, the body begins to releases a salty mixture of liquid that forms on the surface of our skin that when it touches with the air begins to cool our body temperature down.

2) Why do some people perspire more than others while exercising? (Some people do sweat profusely) - can you also mention some factors that affect our ability to sweat, for example, climate/weather, humidity level, what we are wearing, pore size (?).

Fit Men tend to sweat more than fit women even though women have more sweat glands than men. This is usually the sweat glands are much more activated in men than women. Fit people tend to sooner so they can cool their body down faster. In fact, people who are fit tend to sweat more than those who are not as fit. This also also depends on the weather/ humidity,

3) Is perspiring excessively during exercise an indication that I've burned a lot of calories? Conversely, if I don't work up a sweat while exercising, does that mean that I didn't exercise hard enough to burn a significant number of calories?

False, as in question 1, you don’t have to sweat profusely to burn calories. Weight Training is 1 example of being able to burn calories without having to sweat a lot.

In fact sweating a lot may lead to dehydration which means you need to replace your fluids more frequently. Which is why when you have had a long run in the heat or had t a hot yoga class, you will weigh lighter. Keep in mind that this is water weight.