AceShowbiz -

Serena Williams looks ready to pop, but it doesn't stop her from building her body. The professional tennis player took to Snapchat to post videos of her having an intense workout at a gym although she's eight months pregnant.

In one of the videos, Serena was donning a black T-shirt which she paired with leggings and white sneakers. She accessorized with a visor, while her hair was tied into a bun. The mom-to-be could be seen bouncing a medicine ball as her coach instructed her to keep going. In another video, Serena was pushing a sled across the room with amazing strength.

Prior to this, Serena's fiance Alexis Ohanian guested on "Jimmy Kimmel Live!" to talk about her pregnancy. When asked about the baby's gender, the Reddit co-founder said that he didn't know about it yet because he and Serena wanted it to be a surprise. However, they thought that their baby would be a girl. "[Serena] won the Australian Open while pregnant," he told Jimmy Kimmel. "And she remarked that she feels like it has to be a girl because everything that that baby went through and handled like a champ, only a woman could be strong enough to take on."

"This is our first child and if anything, it has reinforced just how amazing and strong and powerful and awesome women are - and how useless we are," Alexis joked. "I'm like, 'I can make you a grilled cheese. Does this help?' We're worthless!"

Although Alexis claimed that he and Serena didn't try to find out about their baby's sex, Venus Williams might have accidentally revealed that her sister is expecting a baby girl. When asked what Serena's baby was going to call her, she answered, "She's going to call me 'favorite aunt.' "