I'm a fan of weight lifting and here's why. First of all I'm stronger hill climbing, skiing, hiking etc. and keeping my quads strong keeps my knees happy.

My usual routine for the legs is squats, single leg lunges, hamstring curls on the fit ball, leg presses, and some core exercises (not enough).

I do lots of cardio, in the summer I ride 150-200 miles per week and often ski 3-4 days per week in the winter, as well as hike and snowshoe.

In Jan. I tore my acl/mcl. I had 6 weeks of rehab on the mcl before acl surgery. For rehab on the mcl I was allowed single leg squats, leg lifts, pilates and some work on the pilates reformer in PT. I was riding my trainer 5-6 hours per week.

For the first few weeks after surgery I was only allowed rom activities, riding the trainer at a limited speed and limited pilates workouts.

During this time I did not gain any weight, however, as I lost muscle mass in my quads, hams and glutes the weight redistributed itself around my stomach.
The fit of my pants was much tighter, my waistline almost disappeared. It's hard to believe how quickly the flab appeared!

I'm 8 weeks post surgery and for about the last 4 weeks I've been doing more weight work , both in pt and the gym. I haven't increased my cardio time yet, still around 5-6 hours but I'm definitely seeing changes back to where I was as I increase the muscle mass in my legs and glutes. I have not changed my diet.

I do not work with a trainer but have been working out in the gym for a long time. I had very good instructors in step aerobics who taught me the proper way to squat and do lunges (that's very important to avoid knee injuries). I follow the guidelines in a book called "Weight Training for Cyclists" by Eric Schmitz and Ken Doyle.

It doesn't take hours in the gym to achieve the gains, you don't want to work out like a weight lifter. You do need total body, however, arms, back, shoulders etc.