Joliet Catholic's Isaac signs with USC

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Joliet Catholic's Isaac signs with USC

Joliet Catholic running back Ty Isaac announced his commitment to USC on Tuesday, choosing the Trojans over fellow front-runners Auburn and Michigan. Isaac was rated by Rivals as a four-star player, the No. 2 prep running back and the No. 18 overall player nationally for the class of 2013.

As a junior, Isaac rushed 178 times for 2,629 yards and 51 touchdowns -- both school records -- leading Joliet Catholic to the 5A title game against Montini. In the championship contest, Isaac shattered numerous state records, rushing for 515 yards and six touchdowns but fumbled twice in the second half as Monitini won 70-45.

Isaac is just the fourth Rivals four-star running back to come out of Illinois since 2002, joining Robert Hughes (HubbardNotre Dame, 2007), Dale Martin (BolingbrookLouisville, 2007) and Rashard Mendenhall (Niles WestIllinois, 2005) as players with that designation.

In the Gym at EFT: Muscle activation

In the Gym at EFT: Muscle activation

In this week's edition of In the Gym at EFT, physical therapist Emily Sluis tackles muscle activation. 

Sluis enlists the help of Super Bowl XLIX Champion Darius Fleming to demonstrate dynamic stretches that get an athlete ready to compete. 

Check out key techniques in the video above, and be on the lookout for the next edition of In the Gym at EFT.

Morning Update: Bulls win first meeting with Cavs; LeBron pays off Cubs-Indians bet

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USA TODAY

Morning Update: Bulls win first meeting with Cavs; LeBron pays off Cubs-Indians bet

Here are some of Friday's top stories in Chicago sports:

Saturday on CSN: Bradley vs. Nevada; Illinois State vs. New Mexico

Dwyane Wade, Bulls take first blood with LeBron James, Cavs

Bears-49ers: And the winner is?

Jonathan Toews practices but won’t play vs. Flyers

For Cubs, winter meetings will be all about the hunt for pitching 

White Sox reportedly asking for No. 1 prospect plus more in trade return for Chris Sale

'Quarterback' Rajon Rondo executes Bulls' game plan, logs first triple-double of the year

White Sox agree to one-year deals with Brett Lawrie, Avisail Garcia

LeBron James pays off bet, rocks Cubs uniform to the United Center

High School Lites basketball roundup: Week 1