You will have to choose between Clyde Hart and Charlie/Kitkat!
(My problem with Clyde’s programme - which you can find on MANY web sites on the internet - is the following: Do you REALLY think that he will provide EXACT examples of his training sessions to the world? I have been at a course which was presented by Clyde and Michael a few years ago … and their practical training and the above-mentioned programmes did not ‘match’!!)
The MAIN question to you - What is your goal with the session 2 x 600m? Endurance? At what intensity do you plan your athletes to run?
When I get answers on the above-mentioned questions - I will try to give some solutions!