The San Francisco 49ers have been decimated by injuries for years. The theory points to a large electrical substation located near the 49ers’ practice facility and Levi’s Stadium, suggesting that low-frequency electromagnetic fields are causing soft-tissue injuries to San Francisco players. Before that, he’d missed just one game in seven-plus years with San Francisco. His durability stands in direct contradiction to the substation theory, at least in his view. Either way, San Francisco needs to find solutions before another championship opportunity slips away because the roster couldn’t stay intact.