"When you have that, that creates an environment of improvement," Brooks said.
"You only can be successful through your work. And if you give good effort, you put yourself (in position) to be successful. If you don't, it's luck. And you don't play professional sports to hope for luck."
Brooks said he "needs to see good practices."
"I feel much better," Brooks explained.
On Tuesday, the coach admittedly was feeling pretty good after the first session of the first scheduled two-a-day. But he quickly noted that the league's 29 other coaches likely felt the same way.
"What you do in practice two is what counts now, and so forth as you go along with training camp," Brooks said. "We've got a month to get better and we have to take advantage of every day."