San Francisco 49ers general manager John Lynch said the team has a theory, thanks to sports science, about “building a mountain that gets you calloused and ready to play football.” Sure, the Niners could do walkthroughs all the way up to Week 1 to ensure everybody was healthy, but this is also a team that intends to play a bunch of young players, and the only way for those players to improve is by playing football.

Lynch said competition is the primary way to get better, so the 49ers have been trying to balance how to get better while making sure they stay healthy.

Lynch had injury updates during an appearance on KNBR for some key players, starting with Jauan Jennings.

“Jauan’s working with our health and performance staff, trying to get back out on the field. Jauan got his calf in the

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