The buttocks should move back as you descend, sitting your hips back as if lowering into a chair. This hip-back movement allows you to load the glutes and hamstrings, keeps the chest up, and helps maintain balance with the weight over the midfoot. If you keep the hips level with the knees or let the weight drop forward onto the toes, you lose hip engagement and put more stress on the knees. Keeping the hips up high also prevents proper depth and posterior-chain loading. So, the correct cue is to sit back and let the buttocks move behind you as you descend.

Interferential current uses two high-frequency alternating currents that cross inside the body to create an interference pattern. By placing four electrodes in two crossing pairs over the treatment area, the two currents meet and produce a beat frequency at the target tissue. This low-frequency modulation is what provides the therapeutic effects, and the crossing arrangement helps concentrate the stimulus deeper than a simple two-electrode setup. The other options don’t create this crossing interference field: a two-electrode setup passes current directly between the pair, a premodulated current mixes the signals before delivery but typically uses two electrodes, and TENS is a surface modality that doesn’t rely on tissue-crossing interference patterns.

Montage describes how the electrodes are arranged to derive a signal. A quadripolar montage uses four electrodes placed in a cross pattern around the area of interest. With four contact points, you can form two differential measurements across perpendicular axes and compare them, which helps localize activity more precisely and reduces common noise that affects all electrodes similarly. This setup offers more spatial information than a simple two-electrode arrangement, which provides only a single differential measurement and less ability to pinpoint sources or reject interference. In contrast, a two-electrode (bipolar) setup uses just a pair of electrodes to measure one difference, offering limited localization. A monopolar arrangement uses one active electrode with a distant reference, still essentially a single differential depending on how many references are used. A tripolar arrangement uses three electrodes to create two differentials with a shared reference, but it still involves fewer electrodes and a different configuration than the four-electrode quadripolar cross layout.

Front step-ups are about training a single leg to lift the body onto a step in a controlled, repeatable pattern. Leading with one leg every time creates a stable, predictable movement sequence, which helps recruit the right muscles (mostly the quadriceps and gluteals) in the correct order and improves balance. By keeping the same leg as the leading leg for each rep, you build consistent motor learning, make coaching cues clear, and reduce compensations that can come from switching leads mid-set. This approach also makes progression easier to monitor. Stepping up with the uninvolved leg first can underload the injured leg and encourage compensations. Stepping up with the involved leg and then down with the uninvolved leg changes the loading pattern and can be harder to control early in rehab. Stepping up with both legs together removes the single-leg strengthening component. Therefore, choosing the same leg to lead every time best supports safe, progressive training.