1 year off from the gym and this app. But, starting again

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So, I'm 5ft 8inches. Started the gym again after a year as I couldn't go due to my job. But, I've started eating and gaming properly again and I wanted to see what I'm putting into my body as "fuel". I've always been quite thin so if you struggle to put weight on the add me because I do too but we can support each other. Also, I am a qualified personal trainer so if you need any tips I'll happily give as much knowledge as I know to you. Happy gyming