Extending Life: Good News

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Yes, you can do things to extend your own life !
So say the science researchers. Apparently the science comes out of the Netherlands, as reported by CBC radio yesterday.

Good news? Well,... maybe.

They say one hour of bike riding adds one hour to your life.
Sounds good to me.  Initially.

Imagine, on hearing this news you decided to set yourself a target,or goal, to extend your life by a fixed amount of time.
Let's say one year.

And given my age, 64, and my own expectations of health going forward, let us also say that this goal should be reached in a 10 year period. That is by the time I reach age 74.

Here's how the numbers crunch.
One further assumption. That is that I would work on this goal, doing the exercise 3 times a week, from now on for a 10 year stretch.

Turns out that every exercise session - say every Monday, Wednesday and Friday - I would hop on my stationary bike and pedal for the required time to meet my target.

It would take just over 7 hours of cycling per session to reach the goal.
That's the same as a full shift of a standard work day.
So, if I gave over my life to this goal, then 3 days a week, I would have to put in a full shift on the bike for the next 10 years to add one year to my life.
Seems like I would have just lost 10 years, instead of gaining one.

Or am I missing something?