At which point does an exercise starts being endurance rather

if you can do 12+ reps you should make it harder

>>42102104
Not OP, but what about static exercises like planks?

>>42102184
I would say if you're holding comfortably for a minute you should add some weight.

More than one rep, but less than 5.

Symmetric Strength says that if you can do more than 10 reps you should increase the weight.

It's a continuous thing and it depends on your cardiovascular endurance and conditioning.

To simplify

As you do more reps you transition from skill based (1-3) to strength based (5-18) to endurance based (20+)

But it depends on the movement and conditioning. Someone with great conditioning might be able to do 30-50reps before there cardiovascular system starts failing. Someone with superb skill at high weights might be able to make 2 reps a strength based movement.

But, for most people, 5-15 rep are where the difficulty comes from strength rather than endurance or skill

>>42102501
on incline bench I can do about 5-6 reps with 35s but I can't do 1 rep 45s. should I add 5s?

>>42102586
That's not true at all. They use less than 10 because it's near impossible to estimate 1rm with reps above that

Anything more than 3 reps is cardio Tbh