Correct technique is something you should always aim to achieve because if you don’t you simply increase the risk of injury.
It’s not fun getting injured, even if it’s only a minor tweak, it’s still not fun because it stops you doing a wide variety of things. Therefore you should always aim to perform each rep with full control.
Avoid these following commonalities until you have mastered the correct movement pattern for you body.
– Bouncing any reps (Deadlift etc)
– Using momentum to complete reps (rows, bicep curls)
– Partial reps (Bench, or pressing)
– Anything ballistic or plyo based (jumping or explosive work)
This might seem obvious but a great many people forget these simple things and as a result end up injured or worse.
Don’t me ruled by you ego, leave it outside the gym and focus on crisp solid form. Not only will you stay injury free, you will also become a lot stronger and make far more progress. A great way to immediately improve your form is to increase the amount of time it takes to do a rep (TUT*). Lower the weight for 3-6 seconds, pause at the bottom of the rep for 1 second, take 1-2 to lift it and then repeat until all reps are done.
*Deadlift is a tad different, don’t use overly long eccentrics (the lowering part) on these, instead make sure each rep is performed from a dead stop. No bouncing.
Now go, practice good form and stay injury free.