Sen. Bill Nelson campaigned across Tampa Bay Saturday, knocking on doors in southern Hillsborough County and joining a "Hands Across the Sand" demonstration in Clearwater Beach ("As long as I'm around there's not going to be any oil rigs out there!") and, yet again, showing off his inner Jack Palance with an impromptu set of pull-ups with Clearwater firefighters.

The chin-up challenge was on earlier today at Station 46. Here's a look at @SenBillNelson showing our guys how to do it. The senator made a pit stop to visit with firefighters while he was in town for #handsacrossthesand -- the senator won the challenge! pic.twitter.com/oXaeDUOjqa — @clearwaterfire (@clearwaterfire) May 19, 2018

Nelson, 75, rarely misses an opportunity to demonstrate his virility.

From Pinellas, Florida's senior senator moved on to Sun City Center, a retirement area in southern Hillsborough that is no longer the deep red Republican stronghold it used to be. Before canvassing the subdivision with dozens of volunteers, he gave a poolside stump speech citing threats to Florida's environment and Medicare and Social Security as helping persuade him and and wife Grace he needed to run for another Senate term.

"I knew that I could not walk away off the playing field. I had to stay in the fight because of what we have facing us," said Nelson, the career politician positioning himself as the change candidate in the era of Trump and GOP control in Washington. He faces the toughest general election challenge of his long career in Republican Gov. Rick Scott.

Here's Nelson's speech: