<human>:  What are the best exercises for toning up my core?
<bot>: Plank exercises are an excellent choice for toning up your core. 2 They help strengthen both your abdominal and lower back muscles, which helps you achieve a stronger and more defined midsection. 3 Other core exercises that are great for toning up include side planks, mountain climbers, and sit-ups. 4 To maximize the benefits of your workouts, make sure to keep proper form and continue to challenge yourself.