With most people who don't like exercise, I encourage them to focus on the fun.
With my yoga students, I tell them that every movement thing they do should be fun for them. If it isn't, then it becomes a chore. Fun is where it is at.
I had a friend who used all of those reasons above for hating to exercise, and so I said -- lets try something. Lets try to have fun!
We took every free class in everything imaginable for months. Martial arts of every kind, several kinds of dance, ice skating, roller skating, windsurfing, you name it. Anything we could do that was free or low cost.
One day, i said "hey, there's a LARP (live action role play) going on this weekend. my friend is running it. It was vampire based, and my friend is super dramatic. He's also very steam-punk. So, we met with him earlier in the week and he explained the LARP. two vampire families were feuding and here was what was going to go down. It was going to be a very physical 12 hrs (overnight, of course).
He had permissions from multiple buildings to use rooftops, to use stairways, alleyways, warehouses, and two bars -- basically all over town. we would be walking, running, jumping, climbing stairs, chasing, play fighting (with rules). and all kinds of things.
My friend *loved* it. She loved the costumes. the characters, the theatricality. . . and the whole night she was running, jumping, climbing trees, stairs, running through warehouses, etc.
Turns out parkour was a common practice of these LARPers.
She got *seriously* into it. She desgiend her own steam-punk costumes and props, drew a strong character, and took up parkour with the LARPers. They practiced one a week, and had a major LARP once a month. She lived for it.
she changed her diet, loved her workouts, and had to take in her costume three times!
She had *FUN*. sure, there were goals along the way, but everything was in service of 12 hours of playing pretend vampire.
So, I truly, madly, deeply believe in fun.