Renowned fitness trainer, Michelle Bridges, is in deep heat over her post-natal workout tip. “The Biggest Loser” trainer recently posted a workout tip on her Instagram, just three weeks after giving birth to her son.

Her 56-minute workout is split into two parts. The first part consists of 30 minutes of a one minute jog and a one minute walk routine. The second entails 20 seconds of jogging and 10 seconds of walking for the remaining 26 minutes. She has put in a reminder that she is a professional trainer with 30 years of training experience and has asked other new moms to tone it down.

#MBactive only available @bigwaustralia

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Her tips received criticism within minutes of posting. reports that the Bondi based Women in Focus Physiotherapy has termed the post as “irresponsible.” Lyz Evans posted a blog on the website, commenting on the advice given by someone as reputed as Michelle. She has written that Bridges failed to identify that the real issue is not the length of exercise, but the type of exercise.

Evans explains that jogging results in a high impact force. This requires strength and stability from the joints, ligaments and muscles in the body. However, the ligaments and muscles in a post-natal body has a reduced ability to generate strength. This leads to excessive strain being placed on the already weakened body structures including the pelvic floor and pelvic girdle, potentially causing long-term damage.

However, according to Daily Telegraph, Professor Stephen Robson has supported Michelle. “It is really important and there is good evidence that women need to be active in pregnancy and active after birth. Certainly in Ms. Bridges case, she is clearly a professional,” the spokesman for The Royal Australian and New Zealand College of Obstetricians and Gynaecologists said.

“I actually think that we should encourage women to be active. You exercise to a level that you are comfortable with. I don’t personally think we should be chiding people for being responsibly active after birth and every woman should make a personal assessment of how she’s travelling and if there’s any concerns, talk to her midwife or a doctor,” he added.