Another option is to go riding "with" someone...and agree that you will meet back at a certain time for lunch, departure whatever...and if you can't stay with them they are free to zoom off, but someone knows to look for you on the trail if you haven't come back. I rarely keep up with my sons for a full day of riding, but love to follow their lines for learning and feel free to push it knowing someone knows I should be back at a certain time.....