Complex Interval Prescriptions Are Not Necessary

I asked to shang what he felt about complex interval prescriptions so it seems like workouts are getting quite complex they have these whole a minute of this and 20 seconds of that. Do you get greater gains having really complex workouts like that or do you think they should be kept simple extreme answer training is complex but that complexity is coaching for coaches not for athletestraining has to be presented to the athletes as simple as possible I am not fan at all doing mixed intervals your intervals has to aim on certain goals  there is no need to mix this make it complicated to 10 seconds of it of one minute a certain what drop it to certain what by end of the day you are working on one energy system