I did my first enduro when I was 49. I did some hare hare scrambles when I was younger (high school/college). when I rode my first hare scamble, I thought it was really hard and I was happy to just finish. when I did my first enduro I thought it was the hardest thing I had ever done and I was glad I finished the course (although, I hour'ed out). so basically, be proud if you finish your first hare scramble and be happy if you can finish/score a full length enduro in the first season. this year, I started doing some hare scrambles as practice before enduro season starts. they seem easy. here (west coast), an enduro is probably about 3-4+ back-back hare scrambles in effort. for normal conditioning, I ride my bicycle to/from lunch at work (including some highway overpasses), run about 2-3 time a week, do crunches when I feel like it and walk my dogs a couple of times a day. for practice, I try to hit the local OHV park once a week or so and work on technical riding skills and anything that I feel uncomfortable with (going over logs, figure eights on hillsides, some MX track, fast whoops, obstacle course, etc...) depending on the terrain that is normal for your area. I try to ride longer trails when they are open, but usually only 1-2 times a month. good enduro practice, is to take a larger/heavier bike on single tracks. I sometimes ride my xl600r on tight single track for practice a smaller bike will then feel much lighter when you pick it up. practice picking up your bike in odd positions/angles so you can learn technique to make it easy. to put things in perspective, out here (District 36) after one full season of enduros. I'm a middle C rider (I don't care about my ranking in hare scrambles), I hope to make it to B in the next few years. I promised myself that if I make it to middle B, I can get a new (to me bike). recreationally, I ride faster (trails) than most my younger buddies/friends and last longer on trails before I get tired. one big thing to remember for cross country and enduro racing. ride smooth to conserve energy. you will not win the race in the first lap/hour, but you can lose it. cross country and enduro is 90% rider/10% bike. there are older guys than me on '79 vintage bikes that will that not only get first in the vintage class but finish first in overall for that race.