Whether you're working on your deadlift PR, getting ready for a jog, or training for (gasp!) your first pull-up, warm-ups are nonnegotiable. It doesn't matter your fitness level or age either, says ...

I never considered myself a gym person. Cardio was my go-to. As a New Yorker and mother of three, I considered myself aerobically fit - regularly doing cycling classes, tennis, long runs and dog walks ...