1. How many calories does a 70 kg person lose when trail biking for 20 minutes at a moderate intensity?

approximately 100 calories (5 cals per minute)  

Explanation:

The weight, type of exercise and time are major factors in determining how many calories are burned during a particular activity. In a moderate exercise, such as walking, a rule of thumb is that about 5 calories per minute are burned for a 70 kg person. In this regard, it is important to note that there are several factors that modify calorie burn estimation, in special the proportion of muscle mass in the body, which in turn depends on many factors including age (higher in young people), sex (higher in men than women), diet, genetics, etc.

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