i know there are threads on this but i'm starting another one for my own situation since i posted this in the brag complain thread and got no feedback i'm trying to lean up bros. when i've been doing cardio (elliptical) i get sick of staying in the fat loss range (140-160bpm). i hardly break a sweat and feel like i'm accomplishing nothing. so i wind up going into the 170s with bursts into the mid 180s. i do this for 30mins after workouts or 45mins on stand-alone days. how bad is this for muscle loss? i'm 24 years old, 5'10, 215lbs. ~16-17% bf (guesstimate) i'm eating: ~75-100g of carbs a day ~250g protein (with 175g coming from lean meats) 30-50oz of mixed veggies (not included in carb numbers) not sure on my fats #s, probably ~35g how many days a week can i do that type of cardio?