Keltie O'Connor followed a 30-day ab challenge to see whether she could build herself a strong core, and to prove that a six-pack isn't always 'healthy'.

What To Expect In The 30-Day Abs Challenge Each day of the week you'll practice a different move and work a different muscle group in your core. You'll fire up the transverse abdominis, which is ...

A 30-day challenge would just be an empty commitment if I wasn’t able to do the exercise with good form. Just jumping onto a pullup bar and swinging my legs up and down would be a waste of time.