They say the best things in life are free and when it comes to fitness apps, that’s surprisingly true. While there are some worthy apps that require equipment, if you’re on a budget and looking to kick-start your wellness routine or take one that’s already in place up a notch, you can easily do so gratis. Many of these workout apps also help with tracking and planning, so there really is no excuse not to stay on the ball. Here’s a look at some of the most innovative fitness apps. Who knew the key to a six-pack could be in your pocket?