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I'm not sure about muscle mass and stretch marks... But me personally, I've always been a yoyoing up and down with weight so over years this has caused many stretch marks on my skin. To the point ...
Have not had time to get to gym so been doing the same routine at home. Lunch today is beans, smoked sausage spinich and salad. :)
Was at the gym last night for 1 hour so still a little sore, but managed to complete 100 kettlebell swings, 15 cat vomits and 50 crunches. Not bad ...