This document discusses key biomechanical concepts related to strength training exercises. It defines biomechanics as the study of movement and the forces acting on the human body. It emphasizes the importance of stability when performing exercises with free weights to ensure safety and effectiveness. It describes the components of force, angle of muscle pull, inertia, and Newton's laws of motion. It also discusses concepts like work, power, levers, and the equal and opposite reaction principle and how they relate to weightlifting and bodybuilding exercises.

1. BIOMECHANICAL CONCEPT OF
EXERCISES

2. What is Biomechanics?
Biomechanics: The study of movement.
Knowledge of joints, muscle structure, and their
possible actions lead to a better understanding
of what occurs during the execution of strength
and other exercises.
Biomechanics: The science concerned with the
internal and external forces acting on the human
body and the effects produced by these forces.

3. Stability is the act
of maintaining
your body to
ensure safety and
effectiveness
when using free
weights
Stability
Maintaining a
stable (balanced)
body is necessary
to ensure safety
during exercise
execution.
Stability also helps
produce the
desired results
when using free
weights
when doing an
overhead press the
muscles of the legs
and trunk must
contract to hold you
in place
increasing stability is
to bend your knees in
order to lower your
center of gravity
(where your weight is
concentrated)
Foot placement
also plays an
important role

4. Components of Force
1. The magnitude or how much force is applied
to the dumbbells, barbells, or machine
handles
2. The force must have direction: The way in
which the force is applied.
3. The point of application of the force: Where
the force is applied on the body or
implement being used. It plays a role in many
exercises from the overhead press to the
squat
4. The line of action or line of force

5. Angle of Muscle Pull

7. Inertia
Inertia is based on Newton’s first law of motio
1. Resting inertia means that when an object is
at rest it tends to stay at rest unless acted
upon by some outside force.
2. Moving inertia means that when an object is
in motion it will remain in motion unless
acted upon by some outside force

9. The Relationship between Force,
Mass and Acceleration
• Newton’s Second Law of Motion deals with
force and its relationship to mass and
acceleration. In essence, in order to create a
force you must place a mass into motion with
acceleration and a change in velocity.

13. Work
• The actual amount of work that you do is
measured by the formula W = F x D, where W=
work, F= force, and D= distance or
displacement of the object being move.

15. Power
• power is defined as the work done in a unit of
time. To calculate it, you must first consider
the time involved in executing the movement

16. powerlifting, more precise Mastery over the Weight is
required. Lets look at things that may disqualify you:
1.Raising your butt 2.Uneven lockout 3.Dipping of the
bar 4.Heaving of the bar 5.Moving your feet 6.Beating
the Press Command 7.Beating the Rack
Command 8.Pronounced uneven extension during the
Lift 9.Rules about head movement 10.Placement of the
bar on your chest
• Example: the squat and the deadlift, the bench press

17. POWER LIFTING

18. Weightlifting is the more commonly known
sport of these two strength sport giants
• the clean
• jerk and the snatch
Weightlifting requires an extreme amount of
speed and flexibility along with strength.

19. WEIGHT LIFTING

20. Equal and Opposite Reactions
• Newton’s third law of motion, known as the
equal and opposite reaction principle, applies
to weightlifting and bodybuilding exercises

21. Levers
1. First-Class Levers
The first-class lever is similar to
the seesaw, in that it has its
fulcrum between the force
and the resistance

22. Levers
First-Class Levers
The first-class lever
is similar to the
seesaw, in that it
has its fulcrum
between the force
and the resistance

23. Second-Class Lever In
the second-class
lever, the weight
(resistance) is
distributed between
the axis of rotation
(fulcrum) and the
application of force.

24. Third-Class Lever
In the third-class
lever the force is
applied between the
fulcrum and the
resistance.