Best Under-Desk Ellipticals and Bikes

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Under-desk trainers live or die on three numbers: pedal height, noise, and resistance range. Measure the gap between your chair and the underside of your desk first, because an elliptical or bike with a tall pedal stroke will bang your knees into a desk lower than about 29 inches, and the fix (pushing your chair back) ruins your typing posture. Magnetic resistance is the feature that makes these apartment-safe: it is contact-free, so the only sound is the belt, and most quality units stay near whisper level even at speed. Ellipticals glide in an arc and are easier on knees, while pedal bikes give a rounder stroke and usually cost less. Check the resistance ceiling if you want a real workout rather than fidget-level movement, and look for a display that detaches or sits on the desk, since you cannot read a screen buried between your feet. Finally, weight matters twice: heavier units stay planted on hard floors but are harder to slide out of the way.