This takes tremendous concentration and focus of will.

Seventy-four percent of homes heat with oil, and there is a tremendous concentration of automobiles per family.

It was an exercise that required tremendous concentration, possible only if the mind was completely empty.

"He's climbing into this machine that requires tremendous concentration."

It takes tremendous concentration and the ability to perform under pressure to make it to the highest ranks of golf.

It takes tremendous concentration to maintain a lead, especially in this building.

To do this requires tremendous concentration, which would render him vulnerable.

Vaughn looked over at her and saw tremendous concentration reflected in her features.

Reducing mass to the size of an insect required long training and tremendous concentration taught in a graduate course he had not yet taken.

With Michael, it's question of tremendous concentration, moving your feet.