I need help with some exercises for an overweight female with nuerothapy in her feet???????

I could really use some excercises to help strengthen my legs without over doing it,my legs tend to spasm on me when i just walk,im on medication,my legs were alot worse to the point that i could barely feel my toes..walking is getting alot better with me getting up more and walking,but i have bad knees as well and my left knee tends to give out at times making it hard to do anything,it gets really frustrating ! I was a very athletic little girl,chunky but very athletic,i loved playing football,baseball,soccer,and so on and now i just want to ride a bike again,i miss riding it was my favorite thing to do growing up,i had very strong legs,and im asking to please help me get them back....!!

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