This amazing 31-Day Get Toned & Lean Challenge contains workouts for every day of the month. The workouts for each day are short but effective, combining high-intensity interval training (HIIT) and weight lifting to maximize fat burn and weight loss. This amazing 31-Day Get Toned & Lean Challenge contains workouts for every day of the month. The workouts for each day are short but effective, combining high-intensity interval training (HIIT) and weight lifting to maximize fat burn and weight loss.