the.com/callus
your body's bouncer, hired after the door got kicked in too many times.
build modeSkin thickens exactly where friction hits hardest.
guitarist's giftFingertip callus turns string pain into painless playing.
slow formingTakes weeks of repeated stress, not one injury.
name twinBone forms a callus while healing a fracture.
barefoot armorLifelong barefoot walkers grow soles tough as shoe leather.