5/3/1 is actually a good way for an intermiate/experienced Type 3 to train if strength is the main goal.
Here are elements of 5/3/1 that works well for a type 3
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Repetitive (you do the same exercises week in and week out for months or even years if you want)
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Planned in advance (you know the weights you will be using a month or morte in advance)
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“Logical” progression model
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Very gradual/conservative progression
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Few exercises/sticking to the same exercises
*A lot of rest days
The elements that are not ideal for a Type 3 are:
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The low reps
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The small number of progressively heavier warm-up sets
While I HATE to do this, here are suggestions for a type 3 using 5/3/1:
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Instead of doing 5/3/1, you can try 8/6/4 using a 78%/82%/87% instead of 85/90/95% base
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Doing 3-4 gradually heavier warm-ups instead of 2