Knee pain

Hi all ive list a lot of weight going to gym. I suffer foot pain but under physio so thats sorted. But ive noticed if i go on treadmill or gym a lot i get pain in left knee. Not whilst at gym but couple days after. Its like a sharp pain when i walk. I only did bit of running last time did steep grade training . And x-trainer. Dont know if to cut treadmill that i love. Or just percivere and maybe fast walk with no incline. Thanks thought welcome x

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