Resistance bands are an underrated piece of fitness equipment in my opinion. They can build strength just as well as free weights, but are easier to store and less expensive. But one downside of bands ...

Add Yahoo as a preferred source to see more of our stories on Google. One of the best ways to strengthen your core is to tag in a friend, grab a resistance band and challenge your abdominal muscles ...

The Independent and Yahoo will earn a commission from purchases made via links in this article. Pricing and availability are subject to change. As a personal trainer, I regularly use resistance bands ...