Life changing chiropractic for about $20:

Dr. Ruch’s books (WAY cheaper than an adjustment):

Knees: AmazonSmile: GOT KNEE PAIN? Where is Your Tibia?: 9781977224149: Ruch, William: Books

Hips/pelvis (as important as the spine since they mess up everything else if they are off – it’s not just for birthing): The Level Pelvis Method: for Pregnancy and Birthing Ease – Kindle edition by Ruch DC, Dr. William J.. Health, Fitness & Dieting Kindle eBooks @ AmazonSmile.