CMC’s father explains cause of 49ers star’s Achilles tendinitis

Programming Note: Watch "49ers Now" with Matt Maiocco and Jennifer Lee Chan at 4 p.m. PT today from Santa Clara, streaming live on the NBC Sports app. Watch the show later on YouTube and Facebook. Much of Christian McCaffrey's NFL success can be traced to his maniacal work habits. Now, he likely is facing the downside of the countless hours of offseason training. "Tendinitis is an over-training injury, meaning you're training too hard or doing too much, and it turns into tendinitis," Ed McCaffrey, Christian's dad, said on the "Ross Tucker Football Podcast." "If I would say that Christian has a weakness, it's that he sometimes has to protect himself from himself, in terms of training too much and doing too much." The 49ers placed McCaffrey, the 2023 NFL Offensive Player of the Year, on injured reserve on the eve of the team's second game of the season. McCaffrey has bilateral Achilles tendinitis, meaning he has the condition in both legs. "If you have tendinitis, you have tendinitis," Ed McCaffrey said. "I think of it as tennis elbow. You see tennis players get it, and they can't play tennis for a while until it heals up. "He has that in his Achilles. It started with one, then it...