What is it? A four-week programme of Pilates classes, delivered via YouTube videos and performed by Cassey Ho, a freakishly enthusiastic fitness instructor who can't seem to stop touching her hair.

How much does it cost? It's free, although you can pay for DVDs if you want to.

What does it promise? The tag line of the website is, "Train to look like a beauty."

What's it actually like? As a newcomer to Pilates, I attempted the Beginner's Workout Calendar on blogilates.com. The first instruction on day one was, "Wake up and be ready for an amazing four weeks!" which obviously put me in a terrible mood. From there, I tried to follow a YouTube video, which was four minutes of assorted plank-based movements, followed by three minutes of Ho aggressively hawking her sportswear line.

On day four, after a couple of days of admittedly quite effective ab routines, I found myself doing something called a Bubble Butt workout. This is when, disgusted at what I was becoming, I decided that Blogilates wasn't for me.

Best and worst bit The ab workouts really are very good, and Ho puts just enough focus on form to stop beginners feeling too far out of their depth. The worst bit? You're doing something called Blogilates, for crying out loud. Imagine if someone asks you what sort of exercise you're doing. You'll actually have to say the word out loud. You'll be laughed out of town.

Is it worth it? I guess that all depends on how desperately you want your bottom to resemble a bubble.