In the second instalment of our fitness series, My Favourite Exercise, NAIT Personal Fitness Trainer Deanna Sharrat takes a minimalist's approach to working out, using nothing more than a medicine ball and a simple but challenging motion. She calls it the diagonal lunge with medicine ball floor-touch; it covers

• the large muscle groups in the lower body, including the quadriceps, hamstrings and gluteals
• the latissimus dorsi, rhomboids and mid-trapezius in the upper body
• and your core, including the abdominals and erector spinae muscles

Take it slow and steady, and expect to be sore when you're done. A good kind of sore.