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Keith Bulluck was tough as nails over the course of his career, but he's no match for freezing temps and ZERO electricity ... telling TMZ Sports his whole family is struggling amid a gnarly winter storm.
We caught up with the Tennessee Titans great from Brentwood, Tennessee on Tuesday ... and he explained how he woke up on Saturday morning to find out his power was out -- and it still wasn't back days later.
Bulluck walked us through his yard -- showing trees knocked over all around his neighborhood .