Reynolds and Jermar Jefferson took the bulk of the first-team reps at running back during Thursday's practice, Tim Twentyman of the Lions' official site reports.
Reynolds could be looking at another heightened workload this weekend with both of D'Andre Swift (shoulder) and Jamaal Williams (COVID-19) looking unlikely to play. However, with Jefferson further removed from having the flu as well as a thigh injury, his upside could be capped by a committee approach. There's also the risk that there aren't many carries to be split up in the first place if Detroit's weak offense struggles to extend drives against Arizona's fourth-ranked scoring defense this Sunday.