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A small, hard ball for pinpoint self-myofascial release — it reaches small, deep spots a foam roller can't, like the glutes, feet, and around the shoulder blade.
A lacrosse ball (or firm massage ball) is a hard ~6.4 cm (2.5 in) ball used for targeted self-myofascial release on areas a foam-roller is too large to reach: the glutes, the sole of the foot (plantar fascia), the upper back around/under the shoulder blade, the forearms, calves, and pecs. You pin the ball between the muscle and the floor or a wall and apply controlled pressure, optionally with small movements.
Effects mirror other SMR tools — short-term range-of-motion and comfort improvements, mostly neural and transient (see massage-gun, recovery-modalities). Pairs well with stretching (static-stretching).
Pros: dirt-cheap, tiny and portable (fits in a bag/desk drawer — handy for office/desk breaks), precise pressure, reaches small/deep spots. Cons: very firm — easy to apply too much pressure; keep it off the spine, the front/sides of the neck, bony areas, and acute injuries; a softer ball (e.g., tennis ball) is a gentler alternative.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.