Roxanne Mckee on Instagram: "‘Theres’s a difference between useable and visible quads’ Today’s little mobility challenge is an adaptation of an exercise I saw @movementbydavid (my favourite page) do. Whatever your desired quad muscle size, look after your joints. Little mobility movements every day keep your body functional and strong. If you try this, engage your core on the back up way up, and be careful of your ankles, knees and lower back on the way down. Try it…"