60second reps is more for hypertrophy, cos your really pounding the muscles.
using bench as an example for the weights I start with 10reps of 40Kg to get started then I do 10sets heavy with this weight pattern
(this is approx, as I change the weight depending on how well I did the last set)
70Kg
70Kg
75
80
85
85
80
80
75
75
as you can see after the 6th set I start to loose strength and struggling to lift the weight, Im not exploding the weight up anymore but slowly forcing it up with my arms shaking and really feeling the BURN.
When you rest for 3mins you can keep up a heavyer weight and you'll have the energy to be more explosive.
1min rest= hypertrophy (muscle size)
3min rest=more energy for explosive power, larger gains in strength.