Anyway on sencond thought, the only contxet in which your sentence would make sense I can think of at the moment would make me think of a defiant teenager or a child who's throwing a tantrum... 怎么样吧！sometimes used to chanllenge someone to a duel or want to pick a fight with someone. If you parents don't want you to excercise at 24:00, and you don't listen, and then you might say that to them. but it's rude and provocative.

我们可以 讲/谈 一下有关运动的问题

Sorry, this sentence doen't make any sense. 怎么样if used in a question sentence, is usually followed by 啊,or了？means HOW or HOW ABOUT eg：最近过得怎么样啊？ 事情办得怎么样了？ If you are trying suggest talk about sports, you can start with 你喜欢什么体育运动/项目？

We don't use 怎么样 and 吧 together. if you want to ask someone or talk someone about sport. you can say 你觉得运动如何？ How about we talk about sports —— 让我们聊聊运动吧 when we want to talk about sport, we will talk one or two concrete subject —— swimming basketball or some other else

Thank you Natalie this is what I meant! Xie xie ni!