Medicine Balls & Kettlebells
Kettlebells and medicine balls which are known as free weights, can be used in all types of workouts.
You use them in bicep curls, shoulder presses, tricep extensions and even squats.
To gain muscle, you need to progressively add resistance which means that
bodyweight alone may not be sufficient in meeting your fitness goals.
With free weights, you can further push yourself and outperform your previous records.