improved answer: it depends on your weight, age etc. 1 minute of jumping jacks burns 8 calories for an average 150 pound person (according to sparkpeople.com). So about 10-15 mins of jumping will...
Maybe like a few. that would be like, oh I don't know, 7 or 8. That is really not alot!!!
33 per minute, if going ultra double dutch speed.
5oo+ calories.. 1.09 calories every one jumping jack
doing 50 jumping jacks will burn 5 calories