The document describes different swimming strokes: butterfly, breaststroke, freestyle, and backstroke. It provides details on the techniques for each stroke, such as arm and leg movements. Butterfly is described as the second fastest stroke after freestyle, but also one of the most difficult to learn. The document also discusses why swimming is a beneficial activity, noting that it works most muscle groups while being low impact on joints, and can be practiced by people of varying ages and fitness levels.

1. Butterfly
Breaststroke
Freestroke or crawl
Backstroke

2. 
The Freestyle or front crawl is often
the preferred stroke of seasoned
swimmers.

Your arms execute alternating
movements. One arm moves
backwards in the water from an
overhead position towards the hip and
provides propulsion. The other arm
recovers above water from the hip
towards the overhead position.
Atferwards your arms exchange their
roles. The legs execute a flutter kick .

3. 
The breast stroke is the best
known and most popular of
the competitive swimming
strokes.

In breaststroke, both arms
execute half-circular arm
movements at the same
time under water in front of
the swimmer. The arm
recovery also occurs under
water. The legs
simultaneously execute a
whip kick..

4. The butterfly stroke stands out
among the competitive strokes
because of it's unique and
spectacular technique.
 It uses a symmetrical arm stroke
with an above water recovery. It
also uses a wave-like body
undulation and a dolphin kick.
 Butterfly is the second fastest swim
stroke after freestyle. It has a
reputation of being hard to learn
and is quickly exhausting


5. 
As its name suggests,
backstroke is swum on the
back. It uses alternating
circular arm movements and
an above water recovery.
The legs execute a flutter
kick similar to the one used
in freestyle.

Backstroke is faster than
breaststroke but slower than
butterfly

6. Length
50
Width
21 m (minimum) 25
recommended
Number of lines
10, (normally used 8 to
prevent the other two waves)
Line width
2,5 m
Water temperature
25–28 °C (77–82.4 °F)
Light intensity
> 1500 lux
Minimum depth
2,0 m
Volume
2500 m³ o 2500000 litros
(depending on depth)

7. 
Why is it good swim?

Swimming is one of the few physical exercises that benefit the body and which enhances
overall strength, endurance and flexibility at the same time .

Swimming uses most muscle groups and is a demanding exercise that helps maintain
healthy heart and lungs.

Swimming also helps keep joints flexible , especially the neck , shoulders, and pelvis. The
muscle groups that are used particularly when swimming motion vary chosen.

However, practice varieties wave back, breaststroke crowl and involve a greater number of
muscles : abs , biceps and triceps , glutes , hamstring , and quadriceps.

.

Who can swim?

Swimming is an activity that can be practiced by people of any age and any level of fitness.

From sedentary person making their first water " first steps " to competitive swimmer who
trains for a test, swimming is a physical exercise that anyone can develop at their own
level .

8. 
When swimming you increase the level of physical activity and this increase the amount of energy you burn ,
what makes this sport ideal for any weight management program component.

Swimming is generally better for your body than land exercises because your natural ability to float in water
helps prevent the inevitable bumps that can cause injury.

In water, the weight of a person is about 10 % of normal weight, and the range of motion is much higher ,
especially for people who need to get fit and have limited mobility because the water supports weight of the
members.

Therefore, it is a good choice for those who want to exercise, and may have problems with the practice
exercises on land . For example , swimming can be ideal for pregnant women, for those who suffer arthritis
or for those with back problems and weight .

On the other hand , people with lung conditions such as asthma , as the atmosphere of a normally wet pool,
breathe more easily