Indianapolis Colts running back Marlon Mack discusses his off-season, preparing for the 2019 season and more as the team enters phase 2 of their off-season program.

Marlon Mack runs for 20 yards.

NFL Network's Nate Burleson breaks down Indianapolis Colts running back Marlon Mack's career day against the Houston Texans in the AFC Wild Card Game.

The stats suggest the Colts should look to get the run game going early at Arrowhead. Colts reporter Caroline Cann breaks down the storylines heading into the Colts' matchup with the Kansas City Chiefs, including notable stats to be aware of entering the Divisional Round playoff matchup.

Indianapolis Colts running back Marlon Mack shifts his way into the end zone on a 2-yard carry.

Indianapolis Colts running back Marlon Mack breaks through for a big 25-yard pickup behind solid blocking from his O-line.

Watch the best plays from Indianapolis Colts running back Marlon Mack's 154-yard day against the Houston Texans in the AFC Wild Card.

Go inside the helmet of Indianapolis Colts running back Marlon Mack on a 29-yard run against the Houston Texans in the Wild Card round.

Indianapolis Colts running back Marlon Mack's wicked juke move sparks a 29-yard run.

Mack caps Colts' impressive drive with goal-line TD leap

Marlon Mack gashes Texans' defense on big 25-yard run

NFL Network's LaDainian Tomlinson breaks down how running back Marlon Mack was the difference maker for the Indianapolis Colts' offense in their win over the Tennessee Titans in Week 17.

Indianapolis Colts running back Marlon Mack goes untouched for 8-yard touchdown.

NFL Network's Brian Billick breaks down why Indianapolis Colts running back Marlon Mack's impact goes far beyond the stat sheet.

Indianapolis Colts running back Marlon Mack follows his blocks for a goal-line touchdown.

Indianapolis Colts running back Marlon Mack talks to NFL Network's Deion Sanders after the Colts' Week 15 win against the Dallas Cowboys.

Indianapolis Colts running back Marlon Mack takes it up the middle for a 6-yard score.

Colts running back Marlon Mack ran for 139 yards on 27 attempts against the Dallas Cowboys in Indianapolis' Week 15 shutout victory.

Indianapolis Colts running back Marlon Mack rushes for a 6-yard touchdown.

Marlon Mack rushes for a 21-yard gain vs. Dallas Cowboys, 12/16/2018

Marlon Mack rushes for a 1-yard touchdown vs. Dallas Cowboys, 12/16/2018

Indianapolis Colts running back Marlon Mack runs for 19 yards.

Indianapolis Colts running back Marlon Mack rushes into the end zone for a 4-yard touchdown.

A look at the Colts explosive offense during the team's 5-game win streak, brought to you by Teacher Credit Union.

Indianapolis Colts running back Marlon Mack rushes for a 25-yard gain.

According to NFL.com senior fantasy analyst Michael Fabiano, Indianapolis Colts running back Marlon Mack should be considered a fantasy football winner following the league’s big wave of free agency.

The Houston Texans went the entire 2018 regular season without allowing a 100-yard rusher. Marlon Mack took care of that in Saturday’s Wild Card Round matchup, however, as the Indianapolis Colts set playoff records for total rushing yards, and Mack ran for the most yards in Colts postseason history.

The Indianapolis Colts’ 2018 Week 15 Drive of the Game, presented by Hays + Sons, was an eight-play, 44-yard sequence midway through the first quarter that gave the Colts an early 7-0 lead they’d never relinquish in their shutout victory over the Dallas Cowboys.

Indianapolis Colts running back Marlon Mack is up for FedEx Ground Player of the Week and defensive lineman Tyquan Lewis is a nominee for Rookie of the Week after the pair’s performance in the Colts’ 23-0 victory over the Dallas Cowboys in Week 15.

Indianapolis Colts running back Marlon Mack ran for a career-high 139 yards on 27 carries in the Colts’ 23-0 win over the Dallas Cowboys on Sunday.

Marlon Mack, who was in the league’s concussion protocol, was not on the team’s inactives list for today’s Week 13 matchup against the Jacksonville Jaguars, paving the way for the Indianapolis Colts to have their top running back in the lineup.

Indianapolis Colts head coach Frank Reich today announced two players — both on offense — have been ruled out of Sunday’s Week 13 matchup against the Jaguars in Jacksonville.

Indianapolis Colts running back Marlon Mack, in the concussion protocol after being knocked out of last Sunday’s Week 12 matchup against the Miami Dolphins, made his return to the practice field on Thursday. He was one of a few key playmakers to return after missing Wednesday’s practice.

Indianapolis Colts running back Marlon Mack (FedEx Ground Player of the Week) and linebacker Darius Leonard (NFL Rookie of the Week) are, for a second straight week, nominees for weekly league awards. Go vote now, and vote often.

The Indianapolis Colts dominated play on the ground for a second straight week, as running backs Marlon Mack and Nyheim Hines combined for 210 rushing yards in Indy's 42-28 victory over the Bills.

For their efforts against the Buffalo Bills in Week 7, Indianapolis Colts running back Marlon Mack and linebacker Darius Leonard are up for a couple of weekly NFL awards.

Indianapolis Colts running back Marlon Mack set several single-game career highs against the Buffalo Bills on Sunday en route to the Colts’ best rushing performance of the season.

Indianapolis Colts running back Marlon Mack returned to the lineup against the New York Jets on Sunday, and he was able to breathe some life into the offense’s run game.

Two major offensive pieces — left tackle Anthony Castonzo and running back Marlon Mack — were able to be full participants in practice on Wednesday. Could they play Sunday against the Jets? And what else did we learn on the day?

The Indianapolis Colts have been without their lead running back, Marlon Mack, for all but one game this year as he recovers from a hamstring injury. The second-year back is trying to remain patient so that he can stay on the field when he does finally get back.

Indianapolis Colts running back Marlon Mack will miss his second straight game — and third in four games overall — today against the Houston Texans. Who else landed on the inactives list?

Marlon Mack, who has been dealing with a hamstring injury for more than a month, is close to a return to the field for the Indianapolis Colts.

The Indianapolis Colts included running back Marlon Mack and left tackle Anthony Castonzo among their inactives for Sunday's game against the Cincinnati Bengals.

The Indianapolis Colts saw the return of running back Marlon Mack, who has been dealing with a hamstring injury, to the practice field on Thursday. What else did we learn on the day?

Indianapolis Colts head coach Frank Reich said two key players — left tackle Anthony Castonzo and running back Marlon Mack — are not yet ruled out for Sunday's season opener against the Cincinnati Bengals. What else did we learn on the day?

Indianapolis Colts head coach Frank Reich recently told 1070 The Fan’s Dan Dakich that the hope is for running back Marlon Mack, who has a hamstring injury, is that he can play in the 2018 season opener against the Cincinnati Bengals.

Indianapolis Colts head coach Frank Reich said Friday that wide receiver Deon Cain suffered a torn ACL in Thursday's preseason opener against the Seattle Seahawks and will miss the 2018 season.

Indianapolis Colts second-year running back Marlon Mack is cleared for the start of training camp after undergoing offseason labrum surgery.

Examining Indianapolis Colts running back Marlon Mack’s fantasy football prospects for 2018.

Colts.com’s Andrew Walker breaks down the action at Wednesday’s second day of OTA practices at the Indiana Farm Bureau Football Center in Indianapolis.