The Flash’s ability to tap into the speed force not only enables him to run super-fast and for great distances, but it also has other interesting effects on his body. The speed force gives the user such additional gifts as superhuman endurance, an accelerated metabolism and a decelerated aging
process, as well as increased reaction speed and enhanced strength.
One of the most interesting things that comes from all of this, combined with his super speed, is the ability to create the 'infinite mass punch.' It is the most powerful punch of all time and is basically like hitting something, or someone, with more force than a meteor. If that’s not enough, his increased speed and reaction time also gives him the ability to throw up to one billion punches per second. When combined, this makes The Flash one of the most formidable and dangerous members of the Justice League.