Nebraska's freshman quarterback is starting here against Michigan after missing one week with a right knee injury.
Martinez stayed loose on the exercise bike on the visiting sideline while NU's captains were at midfield for the coin toss and then trotted onto the field with the first-team offense.
Martinez worked with starting center Cole Conrad during early warm-ups and chatted with two of the game's officiating crew in the hour before kickoff Saturday.
Martinez, of course, also warmed up last week but did not play against Troy due to a right knee injury suffered Week 1 against Colorado.