to challenge your core
Hold a weight at your chest and slowly raise and lower your knees in a marching position without losing your balance.
Keep your core braced as you bring your dumbbell overhead into a circle. Repeat in the opposite direction.
Hold a challenging weight in one hand (I like 25-50 lbs) and walk without leaning to one side.
Holding a dumbbell, reach toward one knee, then lift across your body and press the weight up to a diagonal.
Hold a weight overhead while you step up onto a box or stool. Keep your core braced the entire time!