SHAPE UP: If your bikini ready routine requires industrial strength Spandex, a stiff drink or two and a beach bag full of dread, it’s time to get in shape. Shape Magazine kicks off its second annual Bikini Body Tour in South Beach this Saturday. Enjoy fitness classes provided by Equinox, see summer fashion shows, sample beauty cabanas and score swag bags from 10 a.m. to 4 p.m. at Lummus Park. Classes are only $10, but attendees must pre-register at the event’s website to attend. Prepare to get the workout of a lifetime. Just keep thinking about bikinis while you feel the burn. GET IT:Classes $10 each. Lummus Park on South Beach, 10th St. and Ocean Drive, Miami Beach.