When it comes to building a rock-solid core, some exercises are better than others. Strong abs can help you move with better posture, protect your spine from injury, and improve your athletic ...

While I don't actively avoid the humble sit-up when training my midsection, I do get excited when I find an ab circuit that's free of them, like this 15-minute session from trainer James Stirling.

Sit-up haters, we've got a sit-up free workout ready and waiting for you to use—but if you love sit-ups, feel free to tack them onto the end of this five-move bodyweight routine. The one thing ...