Céline Dion has been tirelessly working to improve her health ahead of her highly anticipated Paris comeback concerts. “People may not realize how much work Celine put in to fight this condition and to regain her strength and mobility,” a source exclusively tells Us. “It has been constant, consistent work.” Dion, 58, announced in 2022 that she had been diagnosed with stiff-person syndrome, a rare neurological condition that causes muscle stiffness and painful spasms, one year earlier. The singer, who detailed her health battle in the 2024 documentary I Am: Céline Dion, subs...