BigRedBuster said:
The idea is that you don't allow your body to get used to just one movement or exercise. Continually stressing it in different ways will show much bigger gains.
Again, burn more than you take in.
BRB is especially correct with these statements. In your age group, you also need to think about joint & bone health. Range of motion with different excercises will help with both of these. If you just do one thing, it's harder to push the body in regards to calorie management.
I am 6' and ~6 years ago, I decided to drop ~35 lbs. I have kept almost all of it off since then (~32.5 lbs). I played competive sports until my early 30s and that was when weight became an issue. I was running at least 7 miles per day, weight training at least 3x per week and eating healthy and still got out of balance on calorie intake vs expenditure.
It starts & ends with diet for your age group. The healthier you eat, the easier it will be, imo. With the exception of highly processed foods & soda, it's about moderation. Sugar is a killer as with most processed foods. My big issue was fresh fruit. I ate healthy but too much fresh fruit can be like too much soda...
One tip I got from a GI Dr & nutrionist that works with a lot of Olympic & pro atheletes is fiber intake. She was religous about males over middle-age needing well over 40g fiber daily. At least 60% from natural food sources (non-processed veggies). This is bare minimum & her general rule over 35+ was 45-50g per day. For myself, I found that staying within this range gave me way more flexibility with the rest of my diet. Her rule for meals was carb to fiber ratio...
My recommendation is definitely speak with someone in this space (GI and/or nutrionist) as it will make it much easier to make adjustments to your diet. Losing the wieght only to put it back on again starts a very unhealthy cycle. Best to avioid if you can...