TC I dont completely agree on what you term as anaerobic respiriation. My understanding is that exercise that is Anaerobic in nature means physiologically that amount of muscular exertion can be accomplished without the maximum uptake of O2 that is incurred under Aerobic conditions. It is always Anaerobic that goes first. A good example of an anaerobic exercise would be an athlete who is say a 100 yard dash sprinter.He does not go into Aerobic respiration until he has finished the sprint and O2 debt has caught up with him.
A marathon runner is an example of Aerobic exercise where O2 debt has long occurred and your heart and lungs must maintin homeostatsis at the elevated levels you are running at...in otherwords you try to acclimate to a steady state condition between exercise and heart and respiration but that is soley aerobic in nature.
BTW You are correct that lactic acid is the biproduct of muscular exertion. We get sore because the muscles lose their elasticity due to lactic acid build up...Stretching exercises alleveiate the lack of elasticity and help breakdown the lactic acid...thus alleviating those aches.
Yes, normal weight people develop SA, but it's very prevelant for overweight folks to develop it. 
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