I was just reviewing Mach’s training schedules and according to these, he had his athletes do the jump/run/drill circuit twice a week in GPP and carried it right through into the Comp Phase.
When this type of work was introduced into the schedule of two 400m hurdlers who I coached, their times dropped substantially (male 50.84->49.73; female 58.93->57.78). There were some other changes in their training, but I consider this to have been one of the keys to their improvement. They did not train with me at the same period of time, btw.