@marimur Do leg blasters - one of my favorite leg workouts. You can do them anywhere, they are amazing for athletes and skiers, and will destroy your legs in like 5 minutes or less.
10x Air Squat (just normal bodyweight squat)
10x Lunge - Alternating sides
10x Jump Lunge - Alternating side
10x - Jump Squat (jump high, squat deep)
Do all of this with no breaks, at a decent pace.
Rest 60sec and then do another one. (you will probably barely finish one set the first time)
Work your way up to 3 full sets. You can also work your way up to increasing the number of reps in each workout as well.