Day 15 21-Day Jumpstart Fitness Challenge.

There's nothing like a BOSU ball for levelling up a leg workout! This all-lower-body strength session incorporates single-side and offset-load work to engage your core and strengthen the muscles around your hips, knees and ankles.

Options are provided for those who don't have a BOSU, but still want to get in on the fun!

Tools: 2 sets of dumbbells, yoga mat, BOSU (optional)