PHILADELPHIA (WPVI) -- Shoshana shows us an exercise that will shoulders and triceps. Work your upper body and your core - Today's Tip Here's how to walk a plank! -- Today's Tip An intense exercise to get your heart rate up! -- Today's Tip Core exercise you can do with your kids! -- Today's Tip Modified push-up with leg lift -- Today's Tip Shoulder lift & press -- Today's Tip Slide knee squat -- Today's Tip Workout you can do with the kids -- Today's Tip Glute bridge with sliders -- Today's Tip.