Sorry yes by oblique twists i mean standing trunk twists

The only actual 'pain' i get is on or around the kneecap. This is usually when i am bending my leg but it isnt always there. It almost feels like someone is pricking the surface of the skin with a pin and sometimes its a dull ache coming from under the kneecap. I find its worse if i sit down for a while. My main complaint is really the feeling of the muscles pulling and the stiffness of the knee (especially the back of the knee). After walking for a bit the stiffness goes away but comes back after sitting or resting. I find that if i stand up straight and put weight on the leg i can feel what feels like a muscle getting tight at the back of the knee and thigh. I havent had any swelling of any sort that i have noticed but sometime the back of the knee feels a little swollen but its not noticeable to look at

Yesterday while at work i did a lot of leg extensions while at my desk and straight leg raises. After resting at home i could then feel my thigh muscles were quite sore and they were pulling as i tried to walk. Maybe i should give the leg extensions a rest today for my muscles to recover properly. I am finding that even though the exercises that i have been given are making my leg stronger albeit very slowly, my leg muscles seem to 'pull' very easily