I have started interval running this week (5 days out of 7 - ouch!) Only about 35 minutes in total with a warm up. I am wondering how this will affect my weight loss? Does anyone know if it would actually make me gain weight (muscle) or am I not doing enough? I cover about 2.8 miles each time...

I am a bit nervous for my weeks weigh in tomorrow and wondered if its best to leave it a few weeks so I dont get discouraged?