Dallas Mavericks rookie Cooper Flagg continued his on-court development Sunday, joining assistant coach and shooting specialist Mike Penberthy to fine-tune free throw shooting mechanics following practice. The No. 1 overall pick focused on keeping his elbow tight as opposed to allowing it to flare right. 

Watch some clips from the workout below:

Flagg’s work ethic and willingness to learn have been a consistent theme throughout Mavericks training camp, with coaches praising his attention to detail and communication.