Staying on the treadmill can be challenging, especially when you are trying to maintain a regular fitness regime. To keep things interesting, it's important to switch up your workout routine. Synonyms for "stayed treadmill" include "kept pace," "maintained stride," "continued exertion," "persevered," "remained committed," "stuck with it," and "pushed through." You may also consider trying different interval training techniques, varying your speed and incline, or incorporating strength training exercises while on the treadmill. By keeping things fresh and switching up your routine, you can avoid boredom and maintain steady progress towards your fitness goals.