1. Run tall. Running, especially uphill, can be exhausting, but if you bend under the effort it’s more difficult for the lungs to do their thing. On the uphill, keep an eye at the crest or a few yards ahead, not at your feet. If you’re gasping, slow down and pump your arms a little, or if you need to, walk, while keeping your posture tall. Even elite runners will walk a steep hill.

2. Shorten your stride on the way up. And plant your entire foot; climbing on your toes kills your calf muscles. Jump over obstacles. Stepping up on unsteady rocks and roots is not only tiring, it can be hazardous.

3. Be loose on the downhill. Stop braking and allow yourself to fly a little, throwing your arms to the side. But don’t flail. If you lose control, slalom from side to side like a skier. Don’t lean back or dig in your heels to brake (a guaranteed butt slide). Instead, land quickly and lightly.

4. Plot your moves. View the trail like a chessboard. Plan your steps around bumps, dips, soft sand and fallen trees yards before you reach them.

5. Focus on time, not distance. Don’t expect to match your road PR.

6. Diminish your risks. Run in pairs or let someone know where you’re going and when you’ll be back. Take plenty of fuel and fluid, a lightweight jacket and a cell phone, which won’t always get a signal in the mountains, but might. Uphill runners yield to downhill runners. Yell “trail” well in advance of passing another runner or hiker.

7. Find your balance. Slippery downhills let you know what your legs are made of. Build them up between trail runs with weighted squats and lunges, and build your balance using wobble boards.

8. Keep your bearings. Things look different coming back than going. Pause to look around when two or more paths diverge from the one you’re on. Look at trail signs and identify rocks, trees or landmarks on the horizon.

9. Leave no trace. Even in races, trail runners stow empty wrappers and wouldn’t dream of dropping cups like road racers. Stay on marked trails, don’t cut switchbacks and go through, not around, puddles to prevent erosion.

10. Feel like a kid again. Crank it on the downhill, hoot and holler, jump into a stream.

Have FUN!