Can exercise really boost metabolism?

Most people believe that it can and the answer appears to be "yes, but only a little bit".

According to Dr Len Kravitz from the University of New Mexico, resistance exercise can increase muscle mass by about 2kg in the average person thus allowing an extra energy burn of 50kcal/day. Aerobic exercise does NOT increase resting metabolic rate.

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Dr Kravitz introduces the concept of NEAT: Non exercise activity thermogenesis - i.e. all non-structured physical activity. He seems to be stating that NEAT can be increased by for example by "parking at the furthest place in the car park". This may be included in the definition of NEAT, but what I am more interested in is subconscious physical activity such as fidgeting.