toukyuu no mae ni, zyosou, toukyuufoomu, nerai, faururain wo kakuninsuru.

の links the noun 投球 with 前, so 投球の前に literally means before the pitch / before throwing.

• 投球の前に = before the act of pitching
• 前に = before

In many cases, Japanese can also make compound nouns without の, but Aの前に is the very standard and clear pattern for before A.

So for a learner, it is best to think of this as:

• Noun + の前に = before the noun/action/event

Examples:

• 食事の前に = before a meal
• 試合の前に = before the game
• 投球の前に = before pitching

前に sets the timing: before ...

In this sentence, it tells you that the checking happens before pitching.

Pattern:

• Noun + の前に = before a noun/event
• Dictionary form verb + 前に = before doing a verb

For example:

• 寝る前に = before sleeping
• 出かける前に = before going out
• 投球の前に = before the pitch / before throwing

So the structure of the sentence is basically:

• Before pitching, check ...

This is a very common Japanese pattern. When several objects belong to the same verb, Japanese often lists them first and then attaches を only to the final item.

So:

• 助走、投球フォーム、狙い、ファウルラインを確認する

means:

• check the approach, pitching form, aim, and foul line

The を applies to the whole list, not just ファウルライン.

You can think of it like this:

• [A, B, C, D] を 確認する

This is natural Japanese. You do not need to repeat を after every noun.

Japanese often uses commas to list items, especially in instructions, manuals, checklists, and short written guidance.

So this part:

• 助走、投球フォーム、狙い、ファウルライン

is simply a compact list.

In other contexts, Japanese could also use:

• と for a complete list
• や for a partial list
• とか for an informal listing style

But in instructional writing, commas are very common and efficient.

So the tone here feels like:

• a checklist
• a manual instruction
• a coaching reminder

確認する means to check, to confirm, or to make sure of.

In this sentence, it is the main verb. Everything before it leads up to what should be checked.

So the sentence structure is:

• 投球の前に = before pitching
• 助走、投球フォーム、狙い、ファウルラインを = the things to check
• 確認する = check / confirm

Because it is in the plain dictionary form する, the sentence sounds like:

• a neutral instruction
• a written guideline
• a manual-style statement

It is less like direct spoken advice and more like a rule or procedure.

The plain form is very common in:

• manuals
• instructions
• sports guides
• notes
• captions
• written procedures

So 確認する here has a practical, impersonal tone, like:

• Check ...
• One should check ...
• Make sure to check ...

If this were spoken politely to someone, it might be:

• 投球の前に、助走、投球フォーム、狙い、ファウルラインを確認します。
• 投球の前に、助走、投球フォーム、狙い、ファウルラインを確認してください。

But for written instructional style, 確認する is very natural.

Japanese often omits the subject when it is obvious from context.

Here, the implied subject is probably:

• the player
• the pitcher
• the person receiving instruction

So depending on context, the sentence could mean:

• Before pitching, check your approach, pitching form, aim, and the foul line.
• Before a throw, the player should check ...

This kind of subject omission is extremely common in Japanese, especially in instructions and training materials.

助走 literally means a run-up or approach run before an action such as throwing, jumping, or bowling.

Here it refers to the movement leading into the throw.

Depending on the sport or activity, it could mean:

• the steps you take before releasing the ball
• your approach motion
• your momentum-building movement

So it is not the throw itself, but the movement before the throw.

Yes, 投球フォーム means the person’s throwing form or pitching form.

Breakdown:

• 投球 = pitching / throwing the ball
• フォーム = form, posture, technique shape

So this refers to:

• body mechanics
• posture
• motion technique during the throw

It is more specific than just フォーム, because 投球フォーム clearly says it is the form used for pitching/throwing.

狙い means aim, target, or what you are trying to hit.

In this context, it likely means:

• where you intend to throw
• the target area
• your intended direction

So it is not just physical posture; it is also about mental focus and target selection.

Depending on the sport, 狙い could refer to:

• the pins you are aiming at
• the strike zone target
• a strategic target point

Because it is a loanword from English: foul line.

Katakana is commonly used for:

• foreign loanwords
• imported sports terms
• onomatopoeia in some contexts
• emphasis or stylistic effect

So ファウルライン is simply the Japanese way of writing the English-derived term foul line.

Many sports terms in Japanese are written this way, for example:

• フォーム = form
• ストライク = strike
• ボール = ball

Yes, it is natural, especially in an instructional or sports-coaching context.

It has the feel of:

• a training note
• a checklist
• a manual instruction
• a coaching reminder

Because it is compact and omits extra words, it may sound a little stiff in everyday conversation, but that is normal for this kind of writing.

A more conversational version might add words such as:

• 投球の前に、助走や投球フォーム、狙い、ファウルラインを確認しましょう。

But the original is perfectly natural for concise written guidance.

Yes. In Japanese, plain-form sentences in manuals or instructions often function like commands or recommendations without using an explicit command form.

So 確認する here can be understood as:

• Check ...
• Make sure to check ...
• One should check ...

This is similar to how English instructions often use a bare verb:

• Check the oil level.
• Confirm the settings before use.

So even though the Japanese is not a direct command grammatically, it can still work as an instruction.