In this Olympic sport, skiers have to slow their heartbeats during the times they have to shoot
The rifle and pistol competitions are held on shooting ranges, 
where ... they use relaxation techniques to drop their heartbeat to half its normal 
rate, fire... [DOC] [TLE] De-Stress in Seconds | Men's Fitness Magazine [PAR] A winning Olympic biathlete can lower his heart rate and stress level in 20 
seconds.