Former NFL receiver Chad Johnson lobbied his way on Twitter to an unofficial NFL coaching gig with the Cleveland Browns. It appears that Johnson may have already called it quits. Turns out that coaching isn’t easy. According to Cleveland.com’s Mary Kay Cabot, Johnson left camp on Monday to take care of some business. Head coach Hue Jax revealed that Johnson seemed surprised at how difficult coaching was — even from an unofficial capacity. Cleveland started its training camp on Friday. Jax is unsure if Johnson will return to the team. Johnson was at camp to informally work with a group of draft picks. He tweeted on Saturday that coaching brings the best 14-hour work days.