1. jogging, swimming and cycling are mentioned in the passage ( dòng 1 )
2. no, it is one of the best all-round forms of exercise ( dòng 1)
3. it can increase your strength and energy, give you more efficient muscles and a stronger heart ( dòng 2 )
4. yes, they are ( dòng 2 )
5. because you don't have to carry your weight ( dòng 3)
6. ideally they should cycle 2-3 times a week ( dòng cuối )