He played college football for the California Golden Bears and was selected by the Seattle Seahawks in the seventh round of the 2008 NFL draft.

Forsett also played for the Indianapolis Colts, Houston Texans, Jacksonville Jaguars, Baltimore Ravens, Detroit Lions, and Denver Broncos.

He moved to Arlington, Texas, in his sophomore year of high school after living in Mulberry, Florida.

Forsett attended high school at Grace Preparatory Academy in Arlington, where he played football, basketball and ran track.

In his final two seasons, he had 63 touchdowns and rushed for nearly 5,000 yards, leading Grace Prep to two Texas Association of Private and Parochial Schools division 4A state championships.

[1] In track & field, Forsett competed in sprints and relays during his final two years at Grace Prep.

[5] Close to signing day, Notre Dame pulled a scholarship offer from Forsett.

[2] With a deep depth chart at running back, it appeared Forsett would redshirt his freshman year, but an impressive performance in fall camp kept him on the active roster.

In the season opener, Forsett had 34 yards rushing and a touchdown in Cal's victory over Air Force.

During his freshman year, Forsett was used primarily on special teams, returning one kickoff for 11 yards but usually blocking for Marshawn Lynch.

On coverage units, he made three tackles and blocked a punt in the endzone for a touchdown against Washington.

[3] During his sophomore year, Forsett became second on the Cal depth chart at running back.

He filled in when Lynch was injured in the early season and ran for 235 yards against New Mexico State, good for the fourth highest single game rushing effort in school history.

He ran for over 100-yards against Oregon when injuries sidelined Lynch and in Cal's rout of Texas A&M in the 2006 Holiday Bowl.

His 15 touchdowns led all rushers in the Pac-10, and his 1,546 rushing yards finished second, behind Oregon tailback Jonathan Stewart.

For the 2009 season, he was slated to compete with Julius Jones and Edgerrin James for touches in a crowded Seahawks backfield.

On November 15, Julius Jones, the starting running back for the Seahawks, left a game against the Arizona Cardinals with a bruised lung.

With the return of Julius Jones in week 13 against the San Francisco 49ers, Forsett was relegated back to the position of 2nd-string running-back.

When asked if Forsett will be elevated to the position of the primary running back for the Seattle Seahawks, Coach Jim Mora responded,"You'll see them both and we like them both."

On Thanksgiving Day, November 22, 2012, Forsett scored an 81-yard touchdown, the longest running play in Texans history at the time.

In Week 5 against the Indianapolis Colts, Forsett carried the ball a mere 6 times and ran for 42 yards.

In the Divisional round of the playoffs, against the New England Patriots, Forsett carried the ball 24 times for 129 yards.

Forsett broke out in a Week 4 matchup against the division rival Pittsburgh Steelers, running the ball 27 times for 150 yards and helping the Ravens win their first game of the season.

[23] Forsett finished the year having played and started 10 games, rushing 151 times for 641 yards and two touchdowns.

[33] Forsett is featured in the final episode of Long Shot along with Chad Johnson and Larry English.

In 2017 Forsett joined the Ravens' radio broadcast crew, to serve as a color analyst for four regular-season games.