January 15, 2016 02:00 PM

For most moms, getting their children to eat anything green is a big endeavor.

But Younger star Hilary Duff says her son, Luca Cruz, 3½, is all about the spinach — and for good reason.

“You know how little a bag of spinach will melt down when you cook it? He can eat the whole thing,” Duff told PEOPLE at a SoulCycle X Target VIP Event on Thursday. “Basically, he just wants to have big muscles.”

The 28-year-old mom adds, “He’s so funny — we’ll be eating, and he’s like, ‘Is this going to give me muscles? This going to give me muscles?’ ”

Source: Hilary Duff/Instagram

And although his daily dose of greens isn’t his favorite thing to eat, Luca’s got his eye on the prize, jokes Duff.

“You can tell he doesn’t love it, but then he’ll check and be like, ‘Is it working? Is it working?’ ” she says. “He’s thinks it’s going to happen instantly.”

As for her own health, Duff says consistency — and a strong support system — are key to staying on track.

“I tend to get on kicks where if I’m working out, I want to constantly be working out and if I am so busy that I can’t work out, it’s really hard for me to motivate [myself] to do it,” Duff explains.

“I’m lucky to have help. I can call my nanny or my mom and say, ‘I really need to work out! Come over for an hour and watch Luca and let me go.’ I want to be fit and stay in shape, but I need it for my mental state of mind too.”

— Jessica Fecteau

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