5 reasons you may be having muscle spasms
A muscle spasm, or cramp, is when a muscle suddenly tightens up and won't relax.
Transcript
[GENTLE, BRIGHT MUSIC]
stretching
Browse videos by topic categories
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
ALL