Model Miranda Kerr says doing yoga for 12 years has kept her in shape but she also likes to keep fit by going for bike rides with her four-year-old son.

"I've been doing yoga for over 12 years now - I like the (physical and mental) effect it has on my body. I used to do gymnastics so yoga really works for me to keep that core strength and flexibility. I try to do at least half an hour of yoga every day and then I add Pilates and some strength training with weights and resistance bands to elongate and tone my muscles," Kerr said.

She also enjoys hiking and going for bike rides and trips to the park with her son Flynn Bloom, reports femalefirst.co.uk.

"Everything from resistance training to yoga, hiking to going for a bike ride with my son. I'm really lucky that I live in New York. My son is at such a great age, and it's wonderful to explore the city with him. I take him to the park, to the farmers' market, to the playground - and we go out for an adventure," she told Your Fitness magazine.