How do I fix a strength imbalance between my left and right side?

Nikkiey explains that your dominant side does more work in everyday life and in the gym. In bilateral lifts like a barbell squat or a regular leg press, your stronger side naturally takes over, and over time the imbalance gets worse. She has lived this. After two ACL surgeries her left quad atrophied, and her right side started compensating until one quad looked shaped and defined and the other looked smaller and flatter. That's not a discipline problem. It's how the work gets split.

In one leg workout Nikkiey also mentions switching which leg goes first, but her stated default is weaker side first. Either way, the weight stays the same on both sides.

Good unilateral options she lists are single-leg lunges, split squats, step-ups, single-arm rows, single-leg extensions and single-leg hamstring curls. Machines where you can work one leg at a time are useful because the other leg can't quietly overcompensate. Focus on the mind-muscle connection and clean form so the stronger side doesn't sneak back in. Nikkiey is honest that it took her a lot of time, patience and consistency to bring her legs back into balance. If your imbalance comes from an injury, she describes single-limb work as how she rebuilt hers, but check with your doctor before loading an injured area.