Stand tall holding onto a stable support (like a wall or rack) and shift your weight onto one leg. Keeping your torso upright and core engaged, bend the working knee to curl your heel toward your glutes in a controlled manner. Slowly lower your foot back to the starting position, focusing on hamstring contraction throughout the movement. Perform all reps on one leg before switching sides.
Log your standing single leg curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.