I hope the warm up is clear to you.
Core: Select the 4 hardest exercises that you have been doing through the earlier weeks. By now you should have found 4 that challenge you. With these 4 exercises add enough resistance that you can only manage a few (3-6) reps of a few (6-10) seconds of isometric hold. The effort needs to be very near max and the reps or time will hence be low. So you have 4 exercises where you will do between 3-6 reps or 6-10 second iso hold if that is what is called for (such as the L sit). In weeks 1-2 use 4 sets of this. Progress as listed at bottom of description.
For the arms and legs part of the Max workout you have 4 exercises done as couplets.
Couplet #1 is Box Step ups and Push ups
Couplet #2 is Step Downs and Pull ups
You need to select a weight that WOULD allow 8 reps till failure but you are going to do only 4-6 reps in each set of each exercise. So 5 reps of box step followed by 5 reps of push ups. do this couplet taking 2-3 minuets rest between exercises.
Do the same for the second couplet.
In week 1 you’ll do 4 sets as is listed at the bottom of the description. In subsequent weeks add sets as indicated. You’ll always be checking weight and adding as appropriate to keep reps in the 4-6 range. Do not go to failure in these sets.
I hope this helps.