Multiple flex shaft method and system for golf clubs

1. A method comprising:

categorizing a plurality of golf club shafts into a plurality of golf club shaft sets based on a flexibility of the plurality of golf club shafts;

determining a golfing level of an individual to whom a proposed golf club shaft set will be matched; and

selecting the proposed golf club shaft set from the plurality of golf club shaft sets of different golfing levels to fit the golfing level of the individual;

wherein: categorizing the plurality of golf club shafts comprises:

measuring the flexibility of the golf club shafts using a flexibility measuring mechanism configured to apply a predetermined force to the plurality of golf club shafts, wherein the plurality of golf club shafts are decoupled from any golf club heads when the flexibility is measured;

the plurality of golf club shaft sets comprises:

a first golf club shaft set with a first shaft flexibility range and configured for a high golfing level;

a second golf club shaft set with a second shaft flexibility range and configured for a medium golfing level; and

a third golf club shaft set with a third shaft flexibility range and configured for a low golfing level;

the first shaft flexibility range is greater than the second shaft flexibility range;

the second shaft flexibility range is greater than the third shaft flexibility range;

the proposed golf club shaft set comprises proposed golf club shafts and a proposed shaft flexibility variance; and

the proposed shaft flexibility variance of the proposed golf club shaft set is irregular among the proposed golf club shafts within the proposed golf club shaft set.

2. The method of claim 1 , wherein:

an amount of flex for each golf club shaft within the first golf club shaft set is less than

an amount of flex for each golf club shaft within the third golf club shaft set.

3. The method of claim 1 , wherein:

the proposed shaft flexibility variance is linear between three or more of the proposed golf club shafts of the proposed golf club shaft set.

4. The method of claim 3 , wherein:

the three or more of the proposed golf club shafts of the proposed golf club shaft set comprise a non-linear relationship between golf club shaft length and golf club shaft oscillation frequency.

5. The method of claim 1 , wherein:

the first golf club shaft set comprises:

a first subset of shafts comprising a first subset shaft flexibility variance therebetween; and

a second subset of shafts comprising a second subset shaft flexibility variance therebetween;

the first subset shaft flexibility variance is different than the second subset shaft flexibility variance;

the second golf club shaft set comprises:

a third subset of shafts comprising a third subset shaft flexibility variance therebetween; and

a fourth subset of shafts comprising a fourth subset shaft flexibility variance therebetween;

and

the third subset shaft flexibility variance is different than the fourth subset shaft flexibility variance.

6. The method of claim 1 , wherein:

the high golfing level is correlated to at least one of:

a high swing speed; or

a high skill level;

and

the low golfing level correlated to at least one of:

a low swing speed; or

a low skill level.

7. The method of claim 1 , wherein:

the plurality of golf club shaft sets comprises:

a first shaft flexibility range difference comprising a difference between the first and second shaft flexibility ranges; and

a second shaft flexibility range difference comprising a difference between the second and third shaft flexibility ranges;

and

the first and second shaft flexibility range differences are different from each other.

8. The method of claim 1 , wherein:

the first shaft flexibility range is determined from a difference between:

a shaft flexibility of a shortest golf club shaft of the first golf club shaft set; and

a shaft flexibility of a longest golf club shaft of the first golf club shaft set;

the second shaft flexibility range is determined from a difference between:

a shaft flexibility of a shortest golf club shaft of the second golf club shaft set; and

a shaft flexibility of a longest golf club shaft of the second golf club shaft set;

and

the third shaft flexibility range is determined from a difference between:

a shaft flexibility of a shortest golf club shaft of the third golf club shaft set; and

a shaft flexibility of a longest golf club shaft of the third golf club shaft set.