If your knees go inward. Your knees will touch but your ankles wont
Could mean you have Rickets
Having your knees bend inward when you stand could be a sign of weak hip abductor muscles or poor biomechanics. Strengthening exercises for the hip abductors and working on proper alignment and stability through targeted exercises could help correct this issue. It's advisable to consult a physiotherapist or a healthcare professional for a proper assessment and personalized treatment plan.
Increased femoral anterversion is when there is an inward twisting of the thigh bone. Basically, this is when a persons knees and feet turn inward and have a pigeon-toed appearance.
Some good ways to strengthen your knees would be to perform exercises which would strengthen the muscles around your knees. Low impact sports would help to build muscles on your knees as well.
Spending a lot of time on your knees can cause pain after a while. Answer: spend less time on your knees.
No, but it does cause other problems.
No not normally
possible
No no no! Locking your knees while exercising in any way can cause joint problems and hyper-extension. Never lock your knees!
Yes
skateboarding could be one