If you're tight on time or like super-efficient workouts, strengthening your core is the best place to start. Your core (the muscles around your stomach) is responsible for your posture, mobility, and balance, and connects your upper and lower body to improve your workout performance.
Although you can use weights to work your mid-section, there are plenty of equipment-free core strengthening exercises for when you're traveling, away from the gym, or exercising at home. Rolling out a yoga mat can make things a bit more comfortable, but it's not essential.
