Toddler muscle weakness issues

If anyone can help me, I would greatly appreciate it. My son is 6 years old, almost 7. He has never been a really strong kid, but just this summer, he recently started complaining about not being able to do things that require a little strength. When he runs, he bends forward like he is leaning down to pick something up and he complains about not being able to get up sometimes from sitting on the ground. He does say that there is no pain involved. Last year, we had to tone down his writing because he would press so hard that it would break the pencil lead and his teacher just told us last night about his writing being extremely light now. I appreciate anything that you can tell me at this time. My wife and I are thinking the worst of course, so we would appreciate any info
 
I would take him to the pediatrician and have a thorough check up. Then you won't have to worry and wonder. He's a little boy, not a toddler ;). Be sure to let us know what the Dr. says. :)
 
Since this post we have been to the emergency room and then to a specialist at the University of Michigan. The emergency room took blood tests and urinalysis and everything came back normal, but they did not test for anything specific. We then went to the specialist at U of M and he checked my son out pointing out that he showed as if he has some form of MD especially limb girdle. He sent us for blood tests to check CK levels and they came back completely normal. The specialist at this moment is a little stumped because my son shows signs of MD, but the curved in fingers are not a symptom. I appreciate all of the responses. Thank you
 
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