BOSTON ? In Ringling Brothers Bellobration, which is at TD Banknorth garden now through Monday, circus goers will have the opportunity to view the only husband-wife human cannonball team in the world in action.Tina Miser, who is 33, and her husband are human cannonballs. The duo are not from your typical circus family ? they both hail from the small town of Peru, Ind.?We both had extremely average childhoods except for that circus part,” she said. “We grew up doing that as kids and got to try all facets of circus ? well except the human cannonball.”Tina explained her hometown used to serve as winter quarters for circus trains in the 1920s and the town started an amateur circus for local children, which Tina and her husband Brian both participated in.Tina said when Brian graduated from high school he went on to become a flying trapeze artist and had a burning desire to become a human cannonball.Completely self-taught, Brian emphasizes that there is no easy way to learn either how to build a human-shooting cannon or how to be the cannonball itself.?It’s a very secretive art,” which he admits he refined greatly by trial and error. “It’s especially difficult, as no two shots are alike and any tiny shift in the position of your body changes everything.”His persistence and daring eventually led him to a starring role in the grand finale spectacle of the 133rd Edition of Ringling Bros. as “Bailey’s Comet,” an act in which he was shot, by Tina, aflame across the arena floor ? the first and only person ever to have performed the stunt.Tina added there are only 10 human cannons in the world and her family has four of them.?The last two cannons my husband built for Ringling Brothers,” he said. “I was working firing him from the cannon every night and it looked like such a thrill I wanted to try it. I worked on him for months before he agreed to let me try it. I always want to do the things that people say I shouldn’t. I’m all about defying convention and opening doors.”Tina, who has been shot out of a cannon for four years now, said she had one accident that put her out of commission for a while.?It was before I was with Ringling,” she said. “I didn’t want to spend the rest of my life being afraid of the cannon so I forced myself to get back in after I recovered.”What keeps this high flying duo climbing in the cannon night after night despite the dangers??It’s the thrill,” Tina said. “That two seconds you’re flying through the air ? there’s no feeling like it in the world. The payoff is that weightless flight.”In Ringling Bros. Bellobration, Brian and Tina continue to bring new meaning to the word commitment by adding yet more daring twists and turns, including simultaneous, 42-foot high falls as the entrance to their stunning, show-closing double cannon shot. Tina is approaching her 1,000th cannon shot, and Brian his 6,000th but the thrill is still there for them both.?It’s new and exciting every time,” Brian said. “Sometimes it feels as if the whole thing is happening in slow motion and I don’t want it to end.”