Sit-ups alone won't cut it if you want a comprehensive core workout. Luckily, we've chatted to expert trainer Britany Williams to serve up a routine that will strengthen all of your crucial mid-body muscles.
It takes less than 20 minutes and doesn't require any equipment either (although a yoga mat can be handy for extra cushioning on your spine). So, whether you're at home or at the gym, all you'll need is a quick warm up before you tackle it.
