Stars & Their Mini Workout Partners

From Hugh Jackman's running mate Ava to Gisele Bündchen's fellow yogi Vivian, see how these celebs and their kids are shaping up for summer

HIKING

Getting her supermodel body ready for the summer season, Heidi Klum hits the great outdoors with beau Martin Kirsten and sons Henry, 7, and Johan, 6, on May 19 for a family-friendly hike through the Baldwin Hills area of Los Angeles.