Sara Cox believes she is the fittest she has "ever been". The 42-year-old radio presenter - who has daughters Lola, Renee and son Isaac - has admitted she started working out more when she turned 30 and became increasingly more active after giving birth to her brood. Speaking to OK! magazine about her fitness, the blonde beauty said: "I'd say I'm fitter than I've ever been. I don't think your twenties are for fitness, but when I got to my thirties I started to get fit. "I would get fit after having each of my children but it was always slightly tainted with guilt because I would feel guilty if they were with a nanny or at nursery while I was working out." And the star has revealed she attends body combat classes to help maintain her toned physique. Speaking about her workout plan, Sara said: "I go to body combat classes. There's something very tribal about being in a room with 30 other women punching and kicking! "I also go to this place called Frame, which has lots of mini classes that are high intensity, and sometimes I run home from BBC Radio 2. It's a good five and a half miles. "But I do have weeks where I'm a bit rubbish." However, the television personality has revealed a slim body is part of her genetics and runs in her family, and Sara has described her family as "slender and lanky". She said: "I did. I'm lucky because, if you look at the Cox side of my family, we're all quite slender and lanky, so I wasn't battling against. But you're just so knackered running after them all, that's exercise in itself."