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The secret to LeBron James’ superhuman basketball skills has been revealed — and it’s JUICE … (the fruits and veggies kind) … ’cause his wife loves juicing so much she opened up her own shop.

Shay Marie

Savannah James tells TMZ Sports, she opened The Juice Spot this Monday in Miami … and business is already booming.

LeBron has ZERO financial stake in the place … but Queen James says she makes her NBA star husband try out all the flavors before they hit the menu.

The MVP’s favorite juice is the 20/20 — which has carrots and coconuts … and Savannah tells us “I try to stuff the greens in him but it’s tough … he doesn’t like those.”