In many cases,
certain parts of our body are not balanced regarding muscles
strength. And I refer to our legs and arms. We tend to favor our
good arm or leg when lifting weights. The best way to overcome
this is working each separately until both are equal in
strength. If possible, use a leg extension machine that allows
single leg lifts. Otherwise, using both is perfectly fine.
IMPORTANT: If you feel any pain in your knee at all, STOP and
seek advice from a qualified person in your gym. Again, another
reason to avoid lifting heavy weights.