Question

The safest type of stretching for beginners to start with is

Answer 1

There are 7 different types of stretches:

Static
Dynamic
Isometric
Ballstic
Passive
Active
PNF

Begginers should start with the safest types of stretching.
Dynamic is also a movement stretch but a much more controlled and relaxed movement. This is considered a safe stretch for beginners. (ex. - leg swings, arm rotations, torso twists.)
Active is when you assume a position and then hold it there with no assistance other than using the strength of your own muscles. this is also considered for beginning stretchers. (ex. - sitting on ground and reaching for your toes, standing and holding something for balance while pulling your knee up into your chest)

Answer 2

http://livehealthy.chron.com/safest-type-stretching-beginners-start-with-8324.html

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*Sources from Internet