Negatives?

So I hear if you lift about 80% of your max weight all the way up and thien count out about 4 seconds as your bringing it down. By slowly bringing it down it helps rip thoughs muscles and its much more effective for building muscle mass. Is this a good routine to get into say switching out of 3 sets of 10 reps for more of a cardio workout or cercait training like after you get the cut look you want to thien do negatives to buld muscle mass.
 
thats a common lifting style and one of my favored where you lift and then double the lower (IE: 2 seconds pushing 4 seconds lowering) this is good for any percent of your max not just 80%. This is not what real negatives are, real negatives is when you do more than your max (IE: you get help to lift it and then you lower it very slowly and repeat) this style has evidence saying it helps and saying it doesn't, so it's not proven or disproven. personal I think it does work to an extent, I would do this for one week every few monthes. so I do my normal routine for 7 weeks and then 1 week I do my routine with just negatives. make sure you warm up well, and have at least 2 strong spoters. hope that helps I cut out all the technical jargon.
 
I dont really like the lat-pul-down at my gym so i do nagative pull-ups to work my lats, works really well. do think there is anything really scientific about it, ur just contracting the muscle for longer.
 
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