Strength athletes during the offseason rarely go over 70/75% max, at wich you should be able to get some speed in the lift.
Depending on the excercise, controlled but not to slow negative, and as fast as possible positive, whilst keeping perfect form
Pauzed movement are something to improve form and abdominal pressure. They should be mixen in between.
For example Squats. On RTS you squat 3 times per week. Once a regular squat. Once a pauzed squat cause it forces you to ascend with perfect back shape and knee positionning. And once a frontsquat, cause it trains you from resisting to lean forward.
On Sheiko protocols they have days in wich you first do frontsquats or pauze squats, then go do some benchpressing, then return for regular squats. But sheiko is quite brutal.
i'd recommand for any level of development, to have at least 1 regular squat, and have a second day in wich you rotate between fronts and pauzed.
Same story when it comes to conventional/sumo deadlift, pauzed deadlift and deficit/box deadlift.
or benchpress, pauze benchpress, boardpress/floorpress/incline press/military press
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Strength training is about weight. All that matters is good form and going heavy.
I used to do that, and all i'm getting is a very strong erector spinae, but significant stress on the central nerve system
What you should do is work with no more then 75% for a few reps, and work with very short pauzes
example : 4-6 sets of 3-6reps 75% 120 sec break.
i'd advice to follow some kind of schedule for that tho. Controll your overload and deload