I spend every second half exacerbated by the lack of Black & White goals. A flurry of yellow cards early in the 2nd to let off steam & I feel much betterIn terms of concentration and focus, Your brain needs a number of things to function properly. Oxygen, fuel hydration and rest are essential. Half time, make sure you eat, have a drink, take a lot of deep breaths and try to have a few minutes rest before getting back on it. It’s easy to see the game as 1 game and 1 long session to stay focused. Seeing it (and preparing for) 2, 45 minute games should help with the right break in between. Good luck in finding the formula that works for you