>tfw HIIT on bike
>tfw legs give out before lungs hurt
How do I fix this, /fit/? Gl
Bike general, I guess.
Not OP, but I have turf toe and can't run or use an eliptical. I was thinking of starting some HIIT on a bike.
As for legs giving out first, I would assume you make sure you're on a flat area with a good bike geared right. If your legs are giving out too fast, then get more experience on a bike and your legs will adapt. Either way you're getting a great workout.
Reminder that you can achieve this body only though biking.
>attempting anaerobic intervals before you've established a solid aerobic base
Never going to make it on a bike that way.
Your legs give out because you just don't have the muscular endurance to support it. You have to start with basic aerobic endurance, then move on to longer and longer Tempo rides for several weeks, then Threshold rides once or twice a week, then, assuming you built enough recovery time into the schedule, you might be ready for anaerobic intervals. You have to grow more mitochondria in your muscle fibers, and more blood vessels and capillaries to feed your muscles, so they get the oxygenated blood they need to support anaerobic activity. Then you start out with 3-6 minute long intervals at just above what is otherwise sustainable for 10-40 minutes, and after a month of that, you can start doing all-out 30-second sprints. But what you can't do is just bypass all the groundwork and go straight to the highest level of power output and not expect to bonk.
He's relaxed, but if he flexed his quads and hamstrings you'd see that they're huge in comparison to the rest of his leg. His power-to-weight ratio lifting anything with that lower body of his probably rivals, if not exceeds your own, and his muscular endurance would leave way off the back on any ride on any terrain. In other words: you don't really know what you're talking about, all you're doing is judging on appearance, not actual performance ability.