When you embark on an intensity-as-defined-by-more-work-performed-within-the-same-or-less-time protocol:
• Watch variables closely
• Control variables
• Recover enough to outperform
• Bring it
When people walk to lose weight, they have no model in place to ensure success. As you get lighter, you will perform less work even in longer walking workouts. If you’re relying on walking or even running, every ten pounds lost needs to be made up for with a weighted vest.
Again, this is why I prefer the recumbent bike. In fact, I will always enter my weight in as 225. Though I was up to 255, I was still entering my weight on the machine at 225. I’m about 245 now. I still enter my weight as 225. I want to know that the effort on the bike always objectively outdoes the prior. While seated, sure, I’m bearing some of my body weight. But all I care about is if the athletic performance has increased. Once you dink around with the weight and age settings on the machine, you’ll mess up the calculation.
Similarly, when you don't adjust for the loss of bodyweight AS YOU LOSE WEIGHT, you will REDUCE intensity. Or, if you prefer, we can talk calories. You will burn fewer calories as you weigh less. Your metabolism slows down as you become a smaller animal. Therefore, you must make up for it with a commensurate or supra-commensurate output.