Before I started the particular nutrition program that this gym uses with their clients, I was unmotivated ALL the time. My thought was that walking for an hour was wasting time I'd rather be using to write, or garden, or do my taxes.

And the effort of walking, or in fact any exercise, was way more than I wanted to expend doing anything.
So for me it really started when I gave up sugar. It wasn't that I ate a huge amount of sweet things. I didn't eat cake or biscuits/cookies (except at Christmas). I didn't have sugary desserts. I didn't have sugar or any sweetener in hot beverages. I didn't drink soda or sweet drinks or even juices. I rarely had chocolate and when I did it was the dark Lindt Intense range with 85% - 99% cocoa and less sugar.
Mainly, I was a huge fruit eater. I'd snack on fruit - of which there is a huge range in Oz - three or four times a day. So when I cut out sugar, all I really had to do was cut out all the fruit I was eating, and replace it with a protein snack such as tuna, or almonds.
It had an enormous effect. I had a detox headache that wouldn't budge for three days. After that, I started to feel more energy. That's when I started doing weights. Doing weights and strengthening my core meant that when I went on to more intense cardio, I had strength and stamina. It was quite a gradual increase.
But the nutritional program is 70% of this program. Moderate exercise is 20%, and strenuous exercise is just 10% - all of which is do-able. The nutritional program entails 5-6 small high protein/low carb/low fat meals a day, timed, weighed for proportions and in a certain relation to exercise.
For example, I have black coffee before I do my daily early morning 60 minute cross-training or weight session, but no food till afterwards. If I just do cross-training, which is mainly moderate cardio, I wait an hour afterwards before eating to maximise fat burning. If I do weights, I have a protein shake straightaway for muscle repair and strengthening.
I wait two hours after eating to exercise. One day a week is a rest day, but I still do an hour's low to moderate cardio. One day a week is an accelerator day, meaning I only have 5g of carbs per 100g protein meal. When not on an accelerator day, it's about three times that amount of carbs.
Each day in my exercise and eating diary I total the amount of macro nutrients (protein, carbs and fat) I've had, trying to keep to the optimum amounts the trainer has worked out based on my weight, height, lifestyle, age, sex and body type. I ignore calories. This program is all about the proportions of macro nutrients, and drinking 2-3 litres of water every day.
So that's the long answer to your question. The short answer is no, I don't feel unmotivated. I feel exhilarated. My body loves exercise. I sometimes have to hold back because I will get injured if I don't take it a little slower.
Maybe when I get closer to my weight goal it will be harder because I'll be pushing myself harder. I don't know.
I've observed that being overweight means that there is a huge amount of effort just to get moving. It's probably inertia. If I'm using muscles that are strong and well exercised, like my legs, I know I can keep going for ages now. But with muscles that are weaker it's way more effort. As they get stronger I'll still be pushing my limits, increasing stamina and strength - but I believe the sheer effort will feel different, more achievable. Like GOOD effort, instead of agonising effort.