Not spending enough time engaging in physical activity?
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 Could this possibly be a cause? 
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 I'm not sure. I get a lot of exercise but because of my eating my over weight. Of course, my cracking problems seem to hinder in some ways my ability to exercise. 
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 Getting a lot of excercise is bad too as you damage joints through wear and tear. 
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 yeah it should be ok if you rest well though shouldn't it? i mean like resting between exercises 
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 Not really as like for running - when your foot hits the ground, it impacts a weight 3 times your body weight. 
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 Not really as like for running - when your foot hits the ground, it impacts a weight 3 times your body weight. seriously?! 
 how lol
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 Don't know but it does. 
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 I'm pretty sure my joints crack more when I haven't been active for a while. However, the toes are an exception. 
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 Running strengthens the skeleton and especially the joints. Your info is a bit old. Old wives tale I'd say!