Homeostasis is a classical concept of physiology, and will be developed into function-specific homeostasis (FSH) in
this paper. FSH is a negative-feedback response of a biosystem to maintain the function-specific conditions inside the
biosystem. Let Q be the quality of a FSH. A person might simultaneously have many kinds of FSH, {FSHi, i = 1, 2,...
n}, and then has {Qi, i = 1, 2,...,n}. Let Qmax=max{Qi, i = 1, 2,...n}. Qmax represents the health level, and might be
enhanced by training. An individual system might be classified as FSH-essential subsystems (FESs) and
FSH-non-essential subsystems (FNSs) which homeostasis can be written as FESHs and FNSHs for short, respectively.
The training to establish a new FSH can also be classified as extraordinary training (ET) and ordinary training (OT). ET
disrupts the present FSH and establishes FESHs. OT maintains FESHs and establishes FNSHs and then a new FSH, and
then maintains the new FSH. The cellular rehabilitation of low level laser irradiation or monochromatic light might
promote the establishment of FESHs, FNSHs and then FSH, shorten ET or OT period and then promote health.
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