Early this year, a close friend of mine, Rajiv, had his eyes set on finishing the Mumbai half-marathon (approx. 21 km) in less than 180 minutes.
So, crossing the finish line in 160 minutes was something of a major triumph for him. He was genuinely happy.
One another friend, Sameer, ran the same distance and recorded the exact same time of 160 minutes. However, this guy wanted to cover the distance in 150 minutes or less. Consequently, he was shattered.
He described his experience as a massive failure and as a result, his mind and body language were both a reflection of his belief (the belief that he had failed).
Sameer could have labelled his run many things but he chose ‘failure’.