On week 2 it shows 3x(6x40m)
and on week 4 it shows 4x(4x40m)
Why exactly are there brackets there? It’s all confusing to me. Wouldn’t it just be 18x40m
and 16x40m?
The parentheses or brackets are used to indicate the division of the work into sets. There is one amount of time to be used as the rest interval between the reps but a longer rest to be used between the sets. The RI’s are noted for example in the later weeks as 4.5/10. That is, 4.5 minutes between the reps and 10 minutes between the sets.