Oregon Circuits - A circuit starting with a (short hard) run to a 30 second strength exercise focussed on arms, followed by a run to a 30 second strength exercise focussed on legs. Then a run to a 30 second exercise focussed on core, next you will run to a 30 second strength exercise focussed on full body. Finally you run back to the start and rest for 1 minute. You repeat the circuit until time is up.