start at 60% and try to add weight each set
Litvinovs – 10 Unbroken Heavy Front Squats Followed by a 200m Sprint.
Rest 3 minutes after each set. Repeat for 5 rounds. Add or remove weight as needed
Sergey Litvinov (Olympic Throwerwho this workout is named for) did this workouts with 405# at a body weight of 196#