When the going gets tough, I swim, it's the closest thing to a waking meditation, and lets my mind operate at like 200%.
How do I swim: my buddy Lucas got me into it, I only do freestyle and swim without breaks, it's really about endurance and persistence. I don't care about my time, I never look. I just care about pushing myself, on this point where it feel uncomfortable, day in day out.
Most days, I don't have the strength to push myself to the max, but some days I can. Why do I do it? On the day to day, I am building a company which is really hard. I cannot count the times, I stand in front of problems, I think I cannot solve. The only way is to excel, to give more than what I think is possible. Doing it without stopping and then maybe, maybe I will succeed.
Why is it important to challenge myself? Because I've realised the following, whatever mentally challenging situation you put yourself through, all other hard problems become easier. Basically, when you test your psychological and physical limits, other challenges in your life will become easier.
If you stand in front of the impossible obstacles during the day, deal with it by taking yourself through challenging situations, as it will make you a better version of yourself, stronger and better, able to conquer it all.