First, the meaning is different.
1. Doing sports means doing gymnastics.
Doing exercises means doing exercises.
Second, the usage is different.
1.do Practice Usage:
The basic meaning of exercise is to develop and strengthen a certain ability, especially to do a certain action or a series of actions repeatedly for the needs of physical health or energy. Extension can refer to "application", "practice" or "implementation" and "execution".
2. Practice Usage:
"Exercise, exercise" can sometimes be used as an attribute. As a solution of "use, application", the result is often effective, and the solution of "exercise, exercise" is often plural. The basic meaning of sports as a noun is "sports, sports". Refers to "physical exercise" aimed at national fitness. For normal people, it also refers to psychological exercise.
Third, the emphasis is different.
1. Focus on doing sports: the focus refers to physical exercise, not counting.
2. Focus on the problem: focus on the problem, which can be counted.