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The surgeon who fixed my first knee injury advised me to do single legged squads if in any way possible: the balancing aspect is good for activating many small muscles around the knee, and the weight is high enough to maintain muscle mass even after age 50.

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Any easy way to start out with single-legged squats (pistols) is to find yourself a step up or box jump box. Start out low and just step up onto the box for several reps/sets. You can increase the height until just below the knee. You don't want to go too high. After you strengthen from that, you can start doing other progressions for true pistols if you want.

pulling a sled also strengthens the acl which are a weakpoint for many.

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