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 Just if someone is searching for same: 
 i missed an option on the Ambit3 for getting an alert as soon as i hit my Lactate Threshold. And did not really found a solution for me.First i found that you can set Heart Rate Limits for the Sportsmode which sounds great. but i never got an alarm peep when leaving those limits. (somewhere i read that the alarm peeps when your out of the Zone for around 1-2 minutes.) Second i made an “suunto app” which peeps which peeps. i does work. but then i have to create 2 run modes. to choose if i want the alarm or not. 
 /* While in sport mode do this once per second
 lactateThreshold is a user defined Variable*/
 RESULT=SUUNTO_HR;
 if(SUUNTO_HR>=LactateThreshold){
 Suunto.alarmBeep();
 }The easiest option i found and just testet it out, is to create a workout (lets say called LT and as a target i choose lap (thats great because auto lap does not stop this, it stops only when you push the Lap-button). and set your upper heart rate limit. a few seconds after you hit this limit the watch peeps. 
 this works great for me.
