Tony Horton, best known for the P90X workout, says he's thriving at 66 after tweaking his routine. Horton was diagnosed with a rare illness in 2017 and has since followed a flexible plant-based diet.

Despite society's pressure to exercise intensely at all times, the best workout I’ve had in the last year was during physical therapy. Here's why.

If you ever turned on the TV in the 2000s after midnight, you might have seen an informercial for P90X. ... Tony Horton, now preaches the benefits of rest and warns against overtraining.

If you ever turned on the TV in the 2000s after midnight, you might have seen an infomercial for P90X. ... Tony Horton, now preaches the benefits of rest and warns against overtraining.

Tony Horton, the creator of P90X, was diagnosed with a rare neurological disorder. Now, he's fitter than ever at 66, thanks to his new diet and workouts.

If you ever turned on the TV in the 2000s after midnight, you might have seen an informercial for P90X. The exercise program promised shredded abs and bulging biceps for anyone who pushed ...

If you ever turned on the TV in the 2000s after midnight, you might have seen an informercial for P90X. ... Tony Horton, now preaches the benefits of rest and warns against overtraining.

If you ever turned on the TV in the 2000s after midnight, you might have seen an informercial for P90X. ... Tony Horton, now preaches the benefits of rest and warns against overtraining.