A transformable exercise device used both for stability and strength training is disclosed. Embodiments include a main portion comprising a sphere that may be used wholly in the manner of a medicine ball, kettlebell, rolling device, or separated into two hemisphere elements and used for various exercises including push-ups, standing balance, agility training, and weight training. The two hemisphere elements may be easily and securely locked together with a U-shaped locking mechanism that, when actuated, is congruent with the surface of the sphere to create a medicine ball configuration. The locking mechanism may be modified with various handle attachments, or removed and replaced with separate components added externally to the device providing various hand or foot placements, or alter the nature of the exercise equipment. The device may be used in conjunction with current technology to provide visual and auditory feedback on user's balance or repetitions while performing exercises.