When I was younger, my fitness goals were mostly focused on lifting heavy, running faster and fitting into a certain pant size. My motivations look a lot different now that I’m over 40. I do still love to lift and run, but I’m much more concerned with keeping my body injury-free, while maintaining my strength and stamina. So, I devised a workout—which I do regularly—that suits these goals. It targets important muscle groups in the upper body, lower body and core. Article continues below You may like These muscles are responsible for keeping me stable, upright and mobile. The stronger they are, the less susceptible I am to common age-related issues, such as bone and muscle loss, and diminishing balance and coordination. To do the workout, all you’ll need is a yoga mat and a moderately-heavy single dumbbell, like this one. You should also learn how to properly engage your core before trying these exercises. How to do my six-move workout This workout is a circuit, meaning you’ll do one set of an exercise then …