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Core, back and Flexors are often overlooked but are important.
Also Arm muscles are underated but are actually really important. You don't want to do just to do legs and get out of balance.
Also don't just to weights so agillity and balance. They're huge factors in skiing.
Remember to warm up before you do weights and stretch afterwards otherwise they can make your muscles worse.
anything for your core. plyometrics. any upper body weightlifting, but use smaller weights and up the reps.
Leg Presses, Lunges, and SQUATS for legs. And focus on chore like everyone says and don't leave out your obligues(side abs) and lower back. And for rest of body stick to basic compund movments that are proven such as Bench press, dips, pull up, row, Barbell shoulder press etc......