That is a hard point in RoP. You need to have good self awareness.
There are two problems with not having strict number of reps:
- it is hard to estimate what is 50% and 70% of your max;
- it is easier to push yourself if you know the amount you need to do;
So what I do:
I do max on my heavy day. Max meaning - as much as possible, with minimum rest between sets, without vomiting
Then I calculate my speed of swinging per minute.
Then on light day I do 50% speed of last heavy day, on medium day I do 70% speed of last heavy day.
Thanks to this I push myself hard (heavy day) and I also have a fixed number of reps to perform (others).
There are some variations I take into account:
- if I was doing 12 minutes on heavy day and now I have 2 minutes on my medium it is understandable I will be able to rest less, so I increase the speed;
- on the other hand, if last heavy day was 2 minutes and now medium is 12 minutes I will reduce the speed;
- if the weight is big, 1 snatch is heavier than 1 swing, so take this into account;
I do all these calculations before I start (but after throwing dices).
2 more guidelines (I try to take them into account while in session):
- 70% is comfortable max;
- 100% is more
And remember, it is not so crucial to hit 50% and 70%. It is important to vary the load on your body - or scientifically speaking: vary the heart rate zone you train in.