Attachments.

Every device ships with the heads it needs. Spares are $19 each.

Attachments

Five heads. Each one has a job.

Ball

Large muscle groups. Quads, glutes, hamstrings. Start here.

Flat

Everything else. Dense and even, good for calves and pecs.

Bullet

Trigger points and the arch of the foot. Precise, use it briefly.

Fork

Either side of the spine and the Achilles, never on the bone itself.

Wedge

Shoulder blades and the IT band, where a ball skips off.