Effects of Task-Specific Step Training on Reactive Balance

The goal of this clinical trial is to evaluate a novel and pragmatic (i.e., not requiring specialized equipment) task-specific step training regimen that aims to improve reactive balance after tripping. The main questions it aims to answer are: * Does this step training regimen improve reactive balance after tripping compared to no training? * How well does this step training regimen improve reactive balance compared to treadmill training, which is a more commonly studied reactive balance training regimen that uses a specialized treadmill. Participants will: * complete step training or treadmill training (or no training if assigned to the control group) twice a week for three weeks * experience a laboratory-induced trip three weeks later to evaluate their reactive balance