In the main 'chase' or madison sessions, both riders may be on the track at the same time, taking it in turns to race, hand-slinging each other back into action. The non-racing rider will circle the track slowly at the top of the banking until 'slung' back into the race. The hand-sling is an advanced skill that, in some countries, is only allowed for professional riders. The racing rider may also propel a teammate into the race by pushing the seat of the rider's racing shorts.