Why are my legs weak?

I could do 3 sets of 10 leg lifts before surgery and now I feel like I am lucky to make it up the steps. My legs are weak and when I do climb the steps at work I feel slightly "lightheaded". What is this? Will I get stronger any time soon? Am I trying to do more exercise than I should? 3 weeks Post-Op and down 24 lbs.

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