There are activities where I consider my fitness above average:
- Long-term stamina (hiking or cycling for several hours)
- Going up a hill, or going up stairs
I have friends (same sex, same age as me) who have less stamina in these areas, meaning they are either slower than me, or they show more (or sooner) signs of fatigue (sweating, breathing) than me.
However, there are other activities where they have much more stamina than me:
- Playing tennis
- Running for 5-15 minutes, trying to get as far as possible.
- Cycling up a hill (3 minutes)
- Running to catch a train
As you can see, these are mostly areas where you have to give maximal performance for a short time (< 15 minutes).
These acitivities feel like pain to me. When playing tennis, I often feel the strong urge to take a break. However, I enjoy doing the long-term activities listed at the top.
What could be the reasons for this difference?
E.g. do I have smaller lungs, less hemoglobin, or maybe more stamina-instead-of-power genes?
What sorts of training methods could I do to improve my short-term stamina?
I have been doing training sets of 12 minutes on a stationary bicyle (in the gym) for over a year now. The reason I'm doing them is because I want to get better short-term stamina, and I hope that playing tennis will be more enjoyable if I have more short-term stamina. During these 12-minutes workouts, I'm trying to get as much performance as possible. My pulse rate goes to 170 BPM (now higher than 175) during such a workout.
However I don't see any improvement. I currently don't get more performance on the stationary bicycle than when I began doing these workouts, and I don't see any change in the activities listed above.
Grateful for any ideas and suggestions.