[解析]
M:Miss,do you need any help?
W:I want to get fit,but exercise doesn't seem to help.
M:What kind of exercise have you done before?
W:I did jogging now and then,but it was so boring,so I changed to weightlifting.But it was so demanding,and I was afraid of getting injured,so I went bike riding.
M:Oh,I see.You need to be consistent.I suggest you do different kinds of exercise on one day or on different days of the week.This will help hold your interest,so you can keep coming back.