It's a funny thing....she warned me

I do phlebotomy in an outreach clinic. It means when you go to your doctors office and then send you down the hall to get your blood work done that little lab inside the office is where I would work. I help run two different labs they are in two different buildings right next to each other and on occasion I will run back and forth to help in wherever i'm needed. Yesterday being a monday it was a very very busy day. On average we'll see 30-35 people a day on slower days is more like 20-25 split that between an 8 hour day and 2 to 3 different people. I just want to put this in perspective. This Monday we had an average of over 50 patients at each lab and only three of us work covering these 2 labs. One stationary person registering and ordering and occasionally drawing and then I was back and forth drawing and processing and doing some paperwork. I wouldn't say I'm out of shape but I'm not in the best shape either. This only became exhausting going back and forth towards the end of the day. Being on my feet all day is not really what i'm used to. We usually have downtime around lunch time or the end of the day when it slows down a bit. Anyway that night i went to bed a little later than usual. Slept usual, I usually sleep really deep and feel good in the morning. The next morning I actually woke up sore...my legs were actually sore. I wasn't even doing anything over exerting, i did my just just a little faster paced than usual. Toward the end of the day my leg muscles started to almost give out. They were twitching a little. I could feel thrumming on the back of my legs. My muscles slowing twitching or thrumming up and down the back of my legs. This is when I could tell that its getting worse. However my neurologist warned me about this. I asked her since my muscles are degenerating wouldn't it make sense to lift weights or exercise my muscles to build them up so I would never completely use them. She said in theory that is a very good idea however in my case that doesn't work. She said I can't over exert myself. I can't work out like normal people could. Yoga, cycling or treadmills are good ideas but cardio is not. I would feel overly exhausted the next day and the rip and tear of muscles would actually do more damage than good. They wouldn't rebuild themselves normally or correctly. It completely makes sense when she put it in perspective like that. I just wonder if I would continue using my muscles to their full capacity all the time would it maybe slow it down a little?......think happy thoughts!!!