But as all mothers know, losing that post-baby paunch can be especially tricky - especially with a new child to care for.
This week however, Rachel revealed that it is in fact motherhood that has kept her in trim better than anything before.
‘You don’t have time to eat when you have kids’ joked the 36-year-old, who was crowned Sexiest Woman of the Year by FHM in 2014.
‘It’s pretty damn cool’ Rachel said of her win. ‘Especially as I’d just had a baby and at 3am you’re feeling very unsexy!’
Clearly, many disagree.
With four-year-old Amelie already keeping Rachel on her toes, the S Club star welcomed baby Minnie in April 2014, before embarking on The Strictly Come Dancing tour this year.
‘I miss my girls so much now I’m on tour’ said the star. ‘But on my days off I’m straight home.’