'I was sold on carboxytherapy after I saw what it did for my friend: She was 85kg and 1.65m tall and lost more than 20kg with the help of this procedure.

Even though I'm not fat - I'm 60kg and 1.65m tall - I had sagging skin after I gave birth to twins 10 years ago. I put on 34kg during my pregnancy.

I went to an aesthetic doctor about two years ago and paid $120 a session for carboxytherapy on my tummy and buttocks.

It hurt like hell. I would rate the pain level seven out of 10. When the carbon dioxide is pumped into your belly, you feel so bloated. After that, you feel like you're having menstrual cramps for an entire day. I also got bad bruises. But I was determined and lost 4cm on my tummy and buttocks by the third session.

It is money worth spending.

I think it's better than going to a slimming salon or taking slimming pills. I stopped after five sessions because of the bruising and the pain. But I had already achieved my goal of firming up.

Ms Lyn Aw, 33, is a property agent who spent $600 on carboxytherapy