I've put on 30 kg in less then that when i was injured.
We see today Zlatan at an age where 99.95% of players are in severe decay, and he is still in excellent condition. He has an exceptional physique, like Ronaldo.
At 23 years old, beeing a multimilionaire, beeing monitored by a small army of highly skilled physical coaches and psychotherapists, with his physique, its offcourse very possible.
Is 6 kg in 10 months alot ? Considering he's a cardio athlete, yeah, its very impressive. Just like his talent and determination.
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Many call him insulting names. But his determination and mentality, especially reading that bit, radiates juventus.