The initial load used for negative training should be approximately 105 % of your
regular one rep max for the exercise, e.g. if you can bench 200 pounds, use 210 pounds for negative reps.. You can increase this load if you are able to get more
than 6 reps with that weight (6 reps is the most you should do with negative training - if you can do more reps, you aren't using enough weight for it to be maximally
effective).