I would guess that you are spinning at a lot more than 60 RPM if you are bouncing out of the saddle unless you are in a really easy gear. I recommend a computer with cadence. Whether you are training or riding for recreation, keeping the cadence up really saves the knees. In southern Wisconsin we have some rolling hills, so I start a ride spinning at about 60 RPM. After a warm-up, I increase my cadence to between 80 and 90. On climbs I adjust my gearing and try not to let my cadence drop below 70. Keeping the cadence up saves on the legs and gives a better cardio workout.