You don't need to be an elite athlete to trek in the Himalayas, but preparation matters. Start building cardiovascular endurance 6–8 weeks out with activities like hiking, stair climbing, or cycling. Add strength training for your legs and core to handle daily elevation gain with a loaded backpack. Practice walking on uneven terrain if you can, since teahouse trails aren't paved paths. And don't underestimate mental preparation — long trekking days, basic amenities, and unpredictable weather all test patience as much as fitness. The trek rewards steady effort, not speed.