Keli Roberts, trainer and former IDEA Health & Fitness Assn. international instructor of the year, heads to the trails near Jet Propulsion Laboratory for a series of exercises that add up to much more than an outdoor walk: Star balance (Liz O. Baylen / Los Angeles Times)
Step-ups (Liz O. Baylen / Los Angeles Times)
Uphill lateral traveling squats (Liz O. Baylen / Los Angeles Times)
Double-leg stretch (Liz O. Baylen / Los Angeles Times)
Uphill walking lunges (Liz O. Baylen / Los Angeles Times)
Incline push-ups (Liz O. Baylen / Los Angeles Times)
Interval runs, or fartleks (Liz O. Baylen / Los Angeles Times)
