"I Lost Weight -- and Gained So Much Energy!"

Strengthen from the bottom up.

Sylwia says a strong butt is key for running -- and hoisting kids. These glute moves from her class are my go-tos.

Starfish

• Standing with feet hip-width apart and arms by sides, lower into a squat.
• Stand up, sweeping right leg out to side while raising arms in a jumping jack motion.
• Return to squat, switch legs and repeat.
• Continue, alternating sides, for one minute.

Forward-Reverse Lunge Combo

• Standing with feet shoulder-width apart and arms by sides, lunge forward with right leg.
• Keeping low, with left foot planted and left knee bent throughout, step right leg back into a reverse lunge.
• Continue alternating forward and reverse lunges for 30 seconds. Switch sides and repeat.

Curtsy Side Lunge

• Standing with feet shoulder-width apart and arms by sides, lunge forward with right foot, crossing it to outside of left leg, bending both knees 90 degrees (like a curtsy).
• Straighten legs and immediately step right leg out to right into a side lunge.
• Return to start, switch legs and repeat.
• Continue, alternating sides, for one minute.