4-A heavy weight matter

I could write my head off. But I am sticking to one heavy topic. Myself.
For the past five years, I have been trying to reduce my weight. My son turned 5 this March. He gifted me my first 8 kgs and my daughter who came exactly 15 months after him gifted me the remaining 10. I went from a healthy physique to a moderately overweight person.
I wasn’t bothered about it much, till I went back home to my mom and relatives. Now I am very conscious but alas, lack the determination to throw it off. I lost some 4 kgs last year till now owing to mostly missed aerobic classes and a teeny bit of conscious eating. But it’s some 15 months when March completes, so 4 kgs in 15 months just does not seem such a proud achievement.
Even if I had lost one kg per month, I should have lost a huge chunk.
I see this team train every day morning while I drive to work. I photographed them from my car. I wish I could do what they did.
But try I will.
Footnote: I walked the walk today 