I think this guy got it wrong. To me , 45 minutes on a treadmill at that speed 4 times a week is a bit too much. I did the same a year ago and only caused me shin splints and runners knee, i had to cut it down to 30 min twice a week with a long run on sundays.

i heard a few people say if you run, your body is gonna sap and eat away at your muscles. is this true?

@jagonetwot

I’ll listen to the world class fitness model over you buddy. He’s right, get a sweat on and you’re going to burn fat – high intensity cardio all the time is going to **** out some of your hard earned muscle.

if you wan to run fast and burn fat go for intervals or fart-lec training hill running is also good, all these vary the intensity so your body doesn’t get bored and your metabolism stays high, if you can pump your metabolism up you’ll still be burning fat for hours after you stop running…

@canuckman87 well iv not had any problems iv lost fat and am now more or less ripped, it might be certain bodys, i used to run longer before and lost to much muscle, so now keep it high intensity
listen to who u want idiot

i like this it inspired me to take up running as a sport now i run every other day just about thank you greg plitt and thanks for whoever posted the vid

pure cheesey

@sodumb123′s argument….

I’m actually concerned myself… cortisol levels spike up 40 minutes after cardio at 70% heart-rate and whenever I do something like this (i.e run 8km’s for an hour…) I don’t have enough energy to lift weights anymore.

=/ tips anyone? i weigh 113 lbs, but I want my gains to be mostly muscle I do commando pull-ups but not the real ones meh =/

Actually HIIT for 20 minute, 3-4 times a week will give better fat burning results as well as preserve hard-earned muscle better. This is old school and probably gives an impression of better workout because it’s done for longer! However, count in the cortisol (amongst others) and you’re losing more than you’re gaining. No pun intended!

@CydASH hahahahaa!!!