Relaxing effects of SKY & P: Achievement of state of relaxation was further demonstrated by lower blood cortisol (stress hormone) in long term practitioners of SKY and further fall during SKY as also the fall in blood lactate levels after SKY among police trainees at New Delhi. Age, sex and living conditions in police training college were similar. For the lactate study, 24 subjects were chosen (10 amongst experimental group and 14 controls). Experimental group had practised SKY & P for 5 months while control group was not exposed to it. Basal blood lactate level was lower to begin with in those practising SKY & P compared to control and there was a further fall during Kriya (p = 0.0006).