What is question in " Workout "?

First time working out , I'm very busy everyday but I try to make plan out of it so i have something that wanted to ask : 1.Can i workout while shower ? like jumping around streching leg ? 2.I heard that u need to do some strech after workout ? like how by not letting my body gets hurt. 3.For more time i want to workout at night before going to bed , so is it good ? 4.is working out while I'm having sick is good for health or not ? thanks in advanced for answering and considering