The San Francisco 49ers are having a bonus practice on Labor Day as they prepare for Week 1. According to reporters at practice, starting left guard Dominick Puni, edge rusher Yetur Gross-Matos, defensive tackle Kalia Davis, and wide receiver Russell Gage were all back at practice.

The big news, on the day the Niners are hosting free agent wide receiver Kendrick Bourne, is that Jauan Jennings is back at practice:

Jennings re-aggravated the same calf that bothered him during the offseason. That was August 7. At the time, general manager John Lynch said calf injuries tend to linger.

Nearly a month later, where a trade request presumably happened after neither side had been able to agree to a contract extension, Jennings is back in action.

It’s understandable why fans would be frustrated

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