My boyfriend, because he just started training again, and he's super motivated!
I know that even if you do a little bit, it's better than nothing, which keeps me going and makes me want to work harder
Honestly, it ain't easy & I do go through phases of not exercising. Most of us get those low ebs occassionally where you suffer from lack of motivation.
The trick for me has been incorporating exercise into my day-to-day lifestyle: I gave my car to my wife and bought a push bike 3 years ago - I either cycle or I can't get to work! In other words I deliberately blackmailed myself into cycling!! So, even during those low ebs I'm still cycling and so have a baseline level of exercise going on.