Hi
Pressing the STOP button - then pressing START again to recommence the session WILL put down a lap marker...
Pressing STOP is like pressing a PAUSE button.... the timer stops... then, when you press START again, the timer continues to count from where you left off.
Pressing LAP puts down a marker but does NOT STOP the clock
It seems to me you are doing 10 minute circuits and pressing STOP (maybe for a rest) then pressing START again.
Each time you do this you are putting down a LAP MARK.
Hoep this helps
Tris
HEARTRATEMONITOR.CO.UK