Tried and tested: The Body Blitz (plus - a special reader offer)

Amy Falconer signs up for an intense Callanetics course with amazing results.

Edinburgh-based Callanetics instructor, Keira Thorley has come up with with the perfect solution for busy schedules (or those days when you just can't face leaving the house) - online Callanetics classes. Created back in the 80s, Callanetics is a system of exercises focusing on frequent, repetitions of small, precise movements that work on deep set muscle groups to achieve a long, lean and relaxed body. Keira's Body Blitz is 10 classes across 14 days which, she claims, guarantees you will drop a dress size. She encourages you to do a mix of studio-based and online for the best results.

It's hard work but I find the ease of the online system really helps me stick to the schedule. You simply book a class, receive an online link and hey presto, Keira's class is beamed into you own home. I can also confirm that her huge claim is true - much to my surprise, I did drop a dress size - all that sweating and shaking in my living room was well worth it.