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It’ll depend on how much you bench. 2.5kg for a lightweight female lifter is very different to 2.5kg for a large male new to benching and that’s very different to someone benching 140+
Generally jumps in weight should be predefined by your program. If you’re doing a linear progression (just going up when you hit target weights) then I’d jump 2.5kg. If you’re planning to wave progression (e.g. 3 weeks up, drop down, repeat) then you can start to plan for bigger jumps.
For me, if I can add 2.5kg a month to my bench I’d be very happy but actual jumps in working weights are planned around 5-10kg between sessions. But the planned ‘hardness’ or the number of reps will change to accommodate that to a degree.
No one I could ask to spot me last night and not wanting to do the drop and roll of shame I am now sneaking up by 5kg increments instead of my usual 10, which allowed me to get 8 at 55. Prompted me to ask- when it gets heavy, what do you chaps push forward by- 2.5/5/10/something else?