This Summer's Workout Threat-o-Meter
Ouch! Factor: 2—this sensation is more uncomfortable than painful, but it will still distract you from your ride.
Cycle safely: Your elbows should be slightly bent, not locked, and your arms should be perpendicular to your torso. If you had your seat fitted at a bike shop (i.e., you've got the right setup) but the numbness is continuing, it's possible that your hands are being lulled to sleep by the vibrations from aluminum handlebars. Loosening your grip, wearing padded cycling gloves or investing in handlebar dampers or plugs that absorb some of the vibrations can help.
Next: Addictively fun exercises your trainer doesn't want you to know about