ככל שהגמישות גדולה יותר, כך התרגיל קל יותר.

It is a common Hebrew pattern for a linked comparison: the more..., the more/less...

So here:

• ככל שהגמישות גדולה יותר = the greater the flexibility
• כך התרגיל קל יותר = the easier the exercise

A very literal structure would be something like:

• as the flexibility is greater, so the exercise is easier

But in natural English, the greater the flexibility, the easier the exercise is the best match.

The ש־ is a subordinating particle, usually meaning that or introducing a clause.

In the fixed pattern ככל ש..., it helps form the meaning the more that... / to the extent that...

So:

• ככל שהגמישות גדולה יותר
  = the greater the flexibility is / the more the flexibility increases

You usually learn ככל ש... כך... as one chunk.

Because both nouns are definite in form.

• הגמישות = the flexibility
• התרגיל = the exercise

But Hebrew uses definiteness a bit differently from English:

• With abstract nouns like גמישות (flexibility), Hebrew often uses ה־ even when English might simply say flexibility.
• התרגיל often suggests a specific exercise already understood from context, though English may still translate it naturally as just the exercise.

So the Hebrew can sound more definite than the most natural English translation.

Because גמישות is a feminine singular noun, and the adjective has to agree with it.

• גמישות = feminine singular
• therefore גדולה = feminine singular form of big/great

Hebrew adjectives agree with the noun in:

• gender
• number
• sometimes definiteness, depending on the type of adjective use

So הגמישות גדולה יותר means the flexibility is greater.

Because תרגיל is masculine singular.

So the adjective must match:

• תרגיל = masculine singular
• קל = masculine singular form of easy/light

That is why you get:

• התרגיל קל יותר = the exercise is easier

If the noun were feminine, you would use קלה instead.

Because these are predicate adjectives, not attributive adjectives.

Here the structure is like:

• הגמישות גדולה = the flexibility is great
• התרגיל קל = the exercise is easy

In predicate position, Hebrew adjectives normally do not take ה־.

Compare:

• הגמישות גדולה = the flexibility is great
• הגמישות הגדולה = the great flexibility

So if you added ה־ to the adjective here, it would change the structure and meaning.

Hebrew usually forms the comparative with:

adjective + יותר

So:

• גדול יותר / גדולה יותר = bigger / greater
• קל יותר = easier
• מהיר יותר = faster

Unlike English, Hebrew usually does not add something like -er to the adjective itself. Instead, it keeps the adjective and adds יותר.

In this sentence:

• גדולה יותר = greater
• קל יותר = easier

In present-tense Hebrew, the verb to be is usually omitted.

So:

• הגמישות גדולה יותר literally looks like the flexibility greater
• התרגיל קל יותר literally looks like the exercise easier

But the meaning is understood as:

• the flexibility is greater
• the exercise is easier

This is completely normal in Hebrew.

If you wanted past or future, Hebrew would usually include a form of היה:

• ככל שהגמישות הייתה גדולה יותר, כך התרגיל היה קל יותר
  = The greater the flexibility was, the easier the exercise was

Because the sentence is built around the noun גמישות = flexibility, not the adjective גמיש = flexible.

So Hebrew is saying:

• the flexibility is greater

rather than:

• someone is more flexible

Both are possible in Hebrew, but they are different structures.

For example:

• ככל שמישהו גמיש יותר, כך התרגיל קל יותר
  = The more flexible someone is, the easier the exercise is

So the sentence you have focuses on the amount of flexibility, not directly on a person.

Sometimes yes, especially in less careful or more conversational language, but in standard Hebrew the full pattern ככל ש... כך... is very natural and elegant.

So this is the full, balanced form:

• ככל שהגמישות גדולה יותר, כך התרגיל קל יותר.

You may also hear:

• ככל שהגמישות גדולה יותר, התרגיל קל יותר.

That is understandable and common enough, but כך makes the structure clearer and more polished.

Yes, people do use this pattern, but it sounds a bit more formal, written, or carefully phrased than very casual speech.

It is completely natural Hebrew, especially in:

• explanations
• instructions
• academic or written language
• formal speaking

In very casual speech, someone might choose a simpler structure, but ככל ש... כך... is standard and useful to know.

A reasonable pronunciation guide is:

k'khol she-ha-g'mishut g'dola yoter, kakh ha-targil kal yoter

A few stress notes:

• g'mishuT — stress at the end
• tarGIL — stress at the end
• yoTER — stress at the end

You do not need a perfect transliteration system here; the important thing is recognizing the pattern ככל ש... כך... when you hear it.