Erin Stern gives you double the glute workout for double the results.
HIIT it hard by incorporating a boxing-based fitness workout into your current cardio routine.
Use a Swiss ball to kick your own ass into gear on leg day.
Develop that sexy V-taper with this targeted back and shoulder workout.
Use this advanced training technique to build muscle and endurance in your shoulders.
Lori Harder shares how she builds a long and lean physique topped with sleek and sexy shoulders.
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