Periods of intense difficulty, whether professional or personal, force you to learn and handle tasks outside your comfort zone that you might normally delegate. This forced growth, while uncomfortable, broadens your skillset and makes you a more resilient and capable professional in the long run.

A sales background teaches more than customer centricity. It instills resilience and the fearlessness to approach anyone in an organization to get things done, a vital skill for navigating the cross-functional demands of product management.

Ken Griffin stresses that selling is the most fundamental, yet often overlooked, entrepreneurial skill. It extends beyond customers to constantly selling your vision to candidates, vendors, and partners. He learned this from a mentor's simple plaque: "if we're all going to eat, someone has to sell."

Instead of traditional classroom training, Stone would take new salespeople on live sales calls. They'd observe him, attempt a pitch themselves, and receive immediate feedback. This rapid, immersive cycle built competence and confidence quickly, even for those without a college degree.

Gregg Renfrew's first job selling Xerox copiers in a tough district taught her resilience and sales fundamentals. This early, challenging experience, even in an unrelated industry, provided foundational skills for her future ventures, highlighting the value of high-quality training over industry relevance.

The stress and anxiety felt after a sales interaction goes poorly is not a weakness. It signals a high degree of ownership and responsibility—core traits of successful salespeople. Those who feel this pain are more likely to learn, adapt, and ultimately be trusted by clients.

A founder credited his accelerator's grueling schedule—pitching to 20 investors weekly with harsh feedback—as a transformative experience. This intense repetition wasn't just for fundraising; it was a powerful training ground that polished his core sales and communication skills for all future business dealings.

A commission-based sales job, even if dreaded, provides foundational career skills. It forces you to become comfortable with discomfort and rejection, while teaching the universal skill of persuasion—whether you're selling a product, an internal idea, or your own capabilities to an employer.

Working in sales, with its direct customer interaction and quota pressure, is invaluable training for future product managers. It instills a deep, "rubber meets the road" understanding of customer needs and how a product must solve them to succeed.