Monkey see? Monkey do. Kids mimic the adults around them. Hence the unfortunate playground incident when your 2-year-old let his pal have it with a string of four-letter words. Set a better example: Put a pint-size home gym beside your own. The First Fitness collection by Aqua Leisure is sure to set any youngster on the right track. Products include a child-powered treadmill, elliptical-style air walker, jump rope with digital counter, and a do-it-yourself obstacle course. Now that’s something to shoot off about. Available online at dicksportinggoods.com or leapsandbounds.com. To see styles, go to aqualeisure.com. SEE Big Apple Circus’s Celebrate What: Thirtieth anniversary show where seating is no farther than 50 feet away from ringside. Why: Step right up. When: Sat.-May 4. Where: City Hall, 1 City Hall Plz., Government Center. Tickets at 617-931-2787 or online at artsboston.org. TRAVEL Alliance for Children Multicultural Fair What: Music, dancing, lunch, crafts, and a raffle. Why: Be a globetotter. When: Sat., noon-3 p.m. Where: Wellesley High School, 50 Rice St., Wellesley (781-431-7148). GO American Baby Faire What: More than 100 exhibitors show their wares with free samples, entertainment, and seminars. Why: Shop ’til you drop. When: Sat. & Sun., 10 a.m.-5 p.m. Where: Dana-Farber Field House, Gillette Stadium, 1 Patriot Pl., Foxborough.