The person willing to endure the most amount of pain will always separate from the pack. Pain is inevitable, necessary, and mandatory to reach next levels. It's not whether or not you feel the pain, it's how many times to laugh at it that will dictate your future.
The most successful people have learned, not only to endure pain, but to actually expect and accept it as an important part of the process. It's not something that plays a role temporarily, it'll always be part of your growth. Pain and struggle is the one component to 1% success that keep the majority from attaining their goals. Not being able to conquer it doesn't always come from lack of toughness, but often, a lack of acceptance and understanding that it has to be a major part of the picture.
Every time you bust through a painful experience, you become much stronger and more capable of enduring the next round that will eventually show. The more often you repeat this powerful cycle, the more prepared you become, ultimately creating an unstoppable fighter, able to reach any goal that's set.
Taking it to even a higher level, the 1% Success Stories are made up of people who actually invite pain into their daily routines ... knowing when they conquer it, growth and improvement will be the automatic result. Think about that - asking for struggle to show it's face! That type of mindset is unbeatable and will never lose in the long run - it's fearless, incapable of seeing failure. Imagine yourself living this type of life; playing this type of golf, poker, or running this way on the track.
If you're willing to endure more pain than the person next to you, winning will be your only option!