Collocations for muscle - noun

hard, powerful, strong
taut, tense, tight
relaxed
smooth
lean, ripped, toned
bulging, rippling
cramped
I walked up and down the aisle to stretch my cramped muscles.

pulled, strained, torn
aching, sore, stiff, tired
abdominal, arm, calf, facial, heart, thigh, etc.
skeletal

clench, contract, flex, pump, squeeze, tense, tighten
He flexed his muscles, then set off to run.

loosen, relax
Learn how to relax tense muscles.

control
soothe
stretch
exercise, train, use, work
build, gain, strengthen, tone
diet supplements to build muscle

sculpt
Lifting weights sculpts muscle.

damage, exhaust, fatigue, injure, overload, weaken
pull, strain, tear
I laughed so hard I almost pulled a muscle.

knead, massage
activate, stimulate
paralyse/paralyze

ache, burn, hurt
cramp
strain
clench, contract, flex, stiffen, tense, tighten
go limp, loosen, relax, slacken
stretch
quiver, ripple, tremble, twitch
His muscles rippled beneath his T-shirt as he worked.

bulge
move, work
control sth
the muscles controlling speech production

protest, scream
Suddenly my sore muscles protested and I let out a groan.

cell, fibre/fiber, tissue
mass
group
function
activity
ache, cramp, damage, disease, fatigue, pain, paralysis, soreness, stiffness, strain, weakness
loss, wasting
contraction, relaxation, spasm, tension, twitch
definition, tone
size
endurance, strength
repair
gain, growth
building
builder
boy, man (usually muscleman), mary (BrE,informal)
shirt (AmE), tee (AmE), T-shirt

muscle in
The muscles in my face tensed.