hey zak amazing work out routines!!!
0:23 stool your using is 4-6 inch too low. Again its no sitting in the action, your butt touch the stool and you go back up, with out losing composure.
1:36 Awesome routine to give you explosiveness. But sure about the weight ?. This can be even done with out weights. This not a strength building exercise.
Some weightlifter play with soccer ball to give then agility. Some Do snatch action with a stick.
There some other supporting routines used by Bulgarian wright lifter which I tell you some time next week.
ps:: I was going to tell you about explosiveness work out routine at some point. I am glad you already working on them,