True Fitness PS900 - Manual (Page 8)

Foot
Position
Riders are most efficient if they place
the ball of their foot in the center of
the pedal.
Other riders are more comfortable
if the arch of their foot is against the
pedal. Riders are encouraged to be as
efficient as possible, but use your own
judgement in the comfort/efficiency
tradeoff.
Most riders will find a comfort/efficiency sweet spot at a
pedal cadence around 80 rpm. More serious riders desiring
maximum performance typically pedal at around 100 rpm. For
electromechanical and safety reasons, the bike will not provide
the fully requested workload when your pedal cadence falls below
55 rpm.
Breathe in a regular and relaxed manner. Many exercisers do
not breathe enough, which reduces their exercise capacity and
comfort. You might want to try breathing deeper and more
frequently to see if it helps your exercise regime.
PS900 Owner’s Guide 9
Pedal
Cadence
Breathing
Riding Efficiently and Comfortably
CHAPTER ONE: RIDING YOUR BIKE