Is it mean to tell my boyfriend that I prefer him to lose some weight?

We been together for 12 years now so I feel like I should be honest with him and not lie to him. We talked about how he has gain weight over the months and that he is at his heaviest. I’ve also gain some pounds but just a few not a lot. I talked to him about going on walks or doing some kind of sports. He use to attend a jiu jitsu class and that kept him in shape but ever since he got injured he stopped and he is now better but mean while he got this new hobby and is going to yu gi oh tournaments , which I don’t mind but I rather have him go once in a while to work out. I’ve told him to work out with me but it just doesn’t happen.

Is it mean to tell my boyfriend that I prefer him to lose some weight?
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