Wanna increase stamina?Go to gym and try ti lift few weight.Ur leg must be strong.That's very important.Well,if ur stamina is strong but ur concentration is lost,no chance for u to win.Have to really focus on ur game.Sometimes on competiton,there will be lots of people at ur back.Some of them will make noise while some of them will try to show off or make ur guts down by giving u a tips.They will say la...ur ball is not hook and blablablah....This people really annoying...But,what u have to do is dont bother them.
If u cant get strike,stay calm and think back what ur mistake before u throw da ball.Dont easily loose ur anger there coz many bowlers can easily loose their anger there by kicking da machine.So stupid.It's not the ball mistake but it's his mistake coz didnt throw da ball perfectly.
But first u already get strike,don be too happy coz maybe the next throw will be more worst.So,after get strike,try to recap back the way u hook,u throw and ur timing when throw da ball.This is quite hard coz most people will lose their focus on this.Very Happy until forgot what he do just now..Hahaha...
Well,dont mad when you cant get strike.It's not u compete with other bowlers but it's u and da pin.U r the one who will make da pin strike.So,the conclusion here is,keep focus on what you do.