“The Ultimate Fighter 28: Heavy Hitters” opens with a video package previewing the upcoming season, which will feature the heaviest male and female divisions on the UFC roster: heavyweight and women’s featherweight. Eight fighters from each weight class will compete for a UFC contract and will be coached by two athletes who have won the reality series. UFC middleweight champ and “TUF: Smashes” winner Robert Whittaker will take the helm on one side while “TUF 17” winner Kelvin Gastelum heads the other. The fighters arrive at the TUF Gym for a first introduction to their new environment for the next several weeks.