It sounds like your muscles wanted to rest. It's great that you're motivated to lose the weight. you have to give it time for the body to catch up. You could always research some weight training routines for the legs to strengthen them so they will be a lot more resilient during your journey. Don't worry about them getting muscular, they will get stronger but NOT in a weight lifting athlete sort of way (you would need male testosterone treatments for that kind of muscle growth).
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