calorie spent from workout

kath092010

Hello everyone! I have a question: Beside calorie budget, Is the amount of calorie spent while working out is REALLY important? I am asking this because I am doing Biggest loser boot camp + high Intensity and I am spending aroud 350 to 380 calories but my sister is able to pull off 400 to 420 calorie each time... Does it matter how much calorie we are spending?

thanks!