Wall sits are good for hamstrings and quads

A wall sit is an isometric exercise.  Doing a wall sit only takes a few minutes, but when done consistently there are benefits for hamstrings and quads.  The best approach is to do a wall sit during pre-season for a minute every day, or a couple wall sits every few days.  How long you can hold a wall sit will make it clearer whether or not you need to work on strengthening the muscles that are involved.  Strong hamstrings help to support knees.

Depending on where and when I do a wall sit, sometimes it's easier to slide all the way to the floor when done instead of trying to stand back up.  I prefer to do wall sits where I can reach something for support when standing up.

The last couple of links include video clips.

Muscles Used During Wall Sits
https://healthyliving.azcentral.com/muscles-used-during-wall-sits-3749.html
A text explanation of how wall sits help hamstrings, quads, and potentially adductors, all at the same time

Introduction on how to do wall sits
https://www.wikihow.com/Do-Wall-Sits

Wall Sit Benefits
https://theworkoutdigest.com/wall-sit-benefits/