Her stick-with-it workout tip: Brennan partnered with a friend who was also trying to exercise regularly. "We'd call each other every day to encourage and cheer—and cajole—the other on." "I ...

Resistance band workouts are low-impact, travel-friendly and great for building strength. These band exercises create a full-body burn for women and beginners.

Choose three to four of these nine variations to create your own circuit workout. Just aim for three sets of 12 to 15 reps for each resistance band exercise.