That soreness you feel is lactic acid in the muscle...Afther a work out the muscle is burning the fat, LA happens as a result of the burn..You feel the release of this residue on the next workout because you are lirerally exercising it out of your body...You are correct to work out different parts of the body at different times..The secret is to work out and then give the muscles time to build.. Too much workout can depleat the muscle...You want the muscle to tone and replace the fat..When a muscle is over worked it can tear down instead of burning the fat...Remember a properly toned muscle can burn 75 calories per hour. A properly toned muscle even burns calories when you are sleeping... Nice stretching exercise can be done on a daily basis..If you are going to the gym or lifting free weights look into alternating lower body, upper body and full body work outs on different visits to the gym, This will keep you from loosing muscle due to overworking any part of the body... In response to your question, you can prevent the buildup of lactic acid to some extent through particular training practices, which include appropriate nutrition habits and sport-specific training routines. ... important to understand how and why lactic acid accumulates in the muscles. When glucose is burned for ... is converted to lactic acid, which builds up in the muscles and overflows ... Redsearch this on the net and you will find a perfect diet that will augment your work outs nicely... Total success always, Bonita