Here is a freestyle rotation with Cathe workouts that I have followed. You could use any of Cathe's leg workouts as long as you decrease the weight to about 70% of what you normally did. As freestyle is about low weights and high reps. In this rotaion I also did my upper body more than freestyle suggests for upper so you can take those exerises out if you are just focusing on legs. ..HTH...
WEEK 1
Mon: HSTA, walking lunges
Tues: GS Floorwork, leg extensions, leg curls, abs, 4 mile run, MM shoulders, bi's and tri's
Wed: GS standing legwork,walking lunges, Imax2, MM chest & back
Thurs: Freestyle exercises from book, abs, 4 mile run, PUB shoulders, tri's & bi's.
Fri: PLB floorwork, leg extensions, leg curls, abs, 4 mile, Bodymax chest & back, interval run
Sat: PLB standing, walking lunges, KPC, PH shoulders, bi's and tri's
Sun: long run 10-15 miles
WEEK 2
Mon: Circuit with SS legs, and Circuitmax cardio only, walking lunges, abs
Tues: L&G floorwork, leg extensions, leg curls, abs, 4 mile run, GS shoulders, bi's & tri's
Wed: L&G standing legwork, walking lunges, Imax1, PLB chest & back
Thurs: freestyle exercises from book, abs, 4 mile run, Bodymax shoulders, tri's & bi's
Fri: PS floorwork, leg extensions, leg curls, abs, 4 mile run, PH chest & back
Sat: GS standing legwork, walking lunges, Cardio Kicks, abs, MM shoulders, bi's & tris
Sun: Long run 10-15 miles
WEEK 3
Mon: High Step Challenge, walking lunges
Tues: PHH bun shaper, leg ext, leg curls, abs, 4 mile run, PUB shoulders, bi's & tri's
Wed: PLB standing legwork, walking lunges, Imax3, PUB up only chest & back
Thurs: freestyle exercises from book, abs, 4 mile run, GS timesaver shoulders, bi's & tri's
Fri: PLB floor legwork, leg ext, leg curls, abs 4 mile run, Bodymax chest & back
Sat: L&G/KPC long premix , walking lunges, MIS shoulders, bi's & tri's
Sun: Long run 10-15 miles
WEEK 4
Mon: SJP, walking lunges
Tues: L&G floor legwork, leg ext, leg curls, abs, 4 mile run, MM shoulders, bi's & tri's
Wed: GS standing legwork, walking lunges, MIC, MM chest & back
Thurs: freestyle exercises from book, abs, 4 mile run, CTX shoulders, bi's & tri's
Fri: GS floorwork, leg ext, leg curls, abs, 4 mile run, PH chest & back
Sat: Leaner legs, walking lunges, Taebo workout, ME shoulders, bi's and tri's
Sun: long run 10-15 miles
Running is my main cardio, but you can sub any cardio for the running. With freestyle I think you only need to do 5 days with a 30 min cardio workout.
My freestyle exercises include, calfs, rear lunges, front lunges on a step, squats, plies squats and walking lunges. I normally do 4x20 reps.
Since freestyle focuses so much on lunges whenever I do a Cathe workout with leg presses, I sub rear lunges for the leg presses. You can sub any weight workouts for the ones I do. I work my upper body different than freestyle suggests for upper. Most of the time I go heavy on upper and try for shoulders, bi's & tri's 3 times a week and chest & back 2 times with the exception of the circuit workout I don't go heavy in those. I try for abs 5 times a week and calfs 4 time a week.