A proper-sized male lab should weigh around seventy pounds. I don't know why breeders started opting for bigger and bigger labs. My daughter's lab weighed about 110 most of his life and lived to be thirteen with no irregular joint issues. He wasn't fat, just a huge lab.
My current lab is closer to the breed standard in size and weight. He's very active too. He swims almost every day from early spring to late fall.
Swims with my granddaughter every chance he gets.