One of the key concerns when it comes to working out is avoiding injury. Because no matter how much get-fit success you’re having, how many skinny jeans sizes you’re dropping, or how strong you feel, as soon as you hear that snap, feel that tear, or simply wake up with the inability to engage that muscle… that’s it. You’re out for a little while. Or are you? Sure, you may not be able to run (you can hardly walk!), jump, dance, kick, skate, or ride, but as long as the injury is only lower body, there are still a lot of calorie-burning, muscle-toning, metabolism-tuning, and beyond all of that- endorphins-pumping upper body cardio exercises that you can do. But here’s the kicker (you know what I mean)- you don’t even have to get out of bed.