Warning: The video contains profanity in the text overlay.

A runner learned the hard way the importance of paying attention during training runs after he was hit by a cyclist. The runner, who was wearing headphones, took a hard left to do a U-turn on his run just as the cyclist was attempting to pass on the left.

RELATED: Runners disqualified for wearing headphones at a 10K road race.

As described in the video, which so far has garnered 90,000 views, the cyclist was commuting home on May 12 when he yelled out “on your left” at the oncoming runner, a common practice to notify those ahead of you that you will be passing.

The cyclist soon realized that he didn’t yell loud enough but before he could react, the two collided. Both end up in the grassy area adjacent to the path, fortunate since crashing onto the pavement would be considerably worse. It’s unclear whether the path had a speed limit for cyclists.

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The video was posted the day after the collision occurred. Whenever running with headphones, it’s advised that you keep the music at reasonable levels to ensure you can hear approaching vehicles or people. Maintaining spatial awareness by checking over your shoulder is also important when running on paths, trails, sidewalks or roads.