wookinguibento o kikkake ni, sanpokoosu o kaeta.

Prompted by the walking event, I changed my walking route.

Breakdown of wookinguibento o kikkake ni, sanpokoosu o kaeta.

• を: direct object particle
• 変かえる: to change
• 〜を きっかけ に: prompted by; using ... as a starting point

Questions & Answers about wookinguibento o kikkake ni, sanpokoosu o kaeta.

What does をきっかけに mean in this sentence?

をきっかけに means something like using X as a trigger / prompted by X / taking X as an opportunity.

So:

• ウォーキングイベントをきっかけに = prompted by the walking event / using the walking event as the occasion

It does not always mean a strong logical because. It often means X happened, and that became the starting point for a change.

In this sentence, the idea is:

• there was a walking event
• that event became the reason or trigger
• as a result, the speaker changed their walking route

Why is there an を before きっかけ?

In the pattern X を きっかけに, the を marks the thing that serves as the trigger.

So the pattern is:

• Noun + をきっかけに

Examples:

• 留学をきっかけに、日本語を勉強し始めた。
  I started studying Japanese prompted by studying abroad.
• 引っ越しをきっかけに、生活を見直した。
  I rethought my lifestyle after moving.

This を is part of a fixed expression. It is not the direct object of きっかけ in the English sense; it is just how this grammar pattern is formed.

Why is there a に after きっかけ?