LITTLE ROCK, Ark.—Before last weekend, Michael Smith’s career high in carries was eight.

The Arkansas junior admits he wasn’t physically ready for Saturday night, when he rushed for 157 yards on 22 attempts in a 28-27 win over Louisiana-Monroe. Smith was given an IV at halftime.

“That was mainly because I allowed myself to get out of shape,” he said.

Smith’s season debut was delayed when he was suspended for Arkansas’ opener for improper use of scholarship textbooks. The Razorbacks missed him, relying instead on a couple of freshmen at running back. De’Antho...

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