Team BT's articles on Beginnertriathlete.com
Floor Leg Pull-In

Stability Ball Pike-Up

Stability Ball Pull-In

Stability Ball Hand Opposite Knee Crunch

Stability Ball Side Crunch

Stability Ball Crunch

Legs on Stability Ball Crunch

Scissor Kick

Alternating Knee-Lift Crunch

Alternating Knee Crunch

Bent Knee Hip Raise

Barbell Side Bend

Alternating Heel Touches

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Leg Drops with a Stability Ball