Sometimes customizing is necessary because of an injury or the inability to do, for a short or long period, the kind of exercise you formerly did. When you’re used to customizing for fun, doing it under duress won’t seem like such an imposition. Either way, experiment until you find activities that make you happy as well as healthy. Choose your exercise using the same criteria you’d apply to choosing a date–that is, attractive to you and able to hold your interest for an hour.
The last time I was intimidated was when I was 6 years old in karate class. I was an orange belt and the instructor ordered me to fight a black belt who was a couple years older and a lot bigger. I was scared s—less. I mean, I was terrified and he kicked my ass. But then I realized he didn’t kick my ass as bad as I thought he was going to and that there was nothing really to be afraid of. That was around the time I realized that intimidation didn’t really exist if you’re in the right frame of mind.
I have self-doubt. I have insecurity. I have fear of failure. I have nights when I show up at the arena and I’m like, ‘My back hurts, my feet hurt, my knees hurt. I don’t have it. I just want to chill.’ We all have self-doubt. You don’t deny it, but you also don’t capitulate to it. You embrace it.