I agree! Less is more. Target carefully what you are doing, plan it, and limit it. Sometimes I think more hours trading means LESS money and giving gains away. Also, trading can be emotionally draining with all the stress. Meditation, yoga, exercise, a strict trading plan are all good!!
Balance is the key ! Not necessarily if you just want to push some short to medium term performance of whatever kind... You can press the pedal to the metal for a certain amount of time, in high performance sports, career, business... You can do this for 1 year, 5 years, 10 years, even 20 years, and hope to make it to the top that way. But is it healthy ? Is it fulfilling ?
I realized soon enough that just pushing for more and more dollars (or Euros

) and more and more trades was not the path I want to walk for very long. Life has so much more to offer.
But his is just me. Others might think completly different, and enjoy to really focus their energy on just one very narrow field, and blast away all obstacles like concentrated laser fire.
For me, life has so many beautiful facets to offer, and I try to act in such a way that my trading helps me to enjoy those things even more.
I guess not all, but most people are like this, and want to enjoy time with friends, family. Spend time in nature, eat good food, watch movies, play games and so on. To all those people my advice: be balanced ! Once you know what you are doing in your trading, back off a bit, take it a bit easier. Dont get me wrong ! As long as you are in front of your trading desk you should be concentraded, focussed and work very hard. But limit that time that you spend that way. Most of us here can make all the money they need in the first 1-2 hours of trading. On most days thats where the volume and action is.
After you have done your work, turn off the screen and reward yourself. With whatever feels good to you. But I recommend some kind of physical activity to anybody. Like Andrea Wylan mentioned, Yoga and other disciplines that include some kind of stretching and relaxation are excellent to get rid of tension in your mind and in your body.
Try to be balanced, and complete. You cannot just push it all the time, just like you cannot just tense a muscle nonstop, or breathe out all the time. Fast and slow, tensed and relaxed, hard and soft... all this should be a part of your life.