Spice up your fitness routine with one (or all) of these Caroline Girvan workouts, each of which will leave you sweaty and strong.

This 20-minute Caroline Girvan abs workout falls into the latter — it hurts, but if you’re looking to blast your core, I’ve found a way to do it, without any equipment.

This abs workout comes from Caroline Girvan. I have tried Girvan’s videos before using this dumbbell abs workout, and as her work continues to rake in millions of views, my interest continues to ...