"Just a 5K"

Since Warrior Dash is sold out, I was thinking about doing another 5K on Oct. 6. As I wondered if I should skip it since that would be my last week of Insanity Round 1, I absently thought, "It's just 5K...I can still do my Insanity workout." A 5K was something I wasn't sure I could do such a short time ago, and now it's "just a 5K".