To maintain motivation during a long-term fitness journey, set achievable goals and track progress regularly. Incorporating variety into workouts can prevent boredom, while finding a workout buddy can provide accountability and encouragement. Celebrating small victories and recognizing improvements can boost morale. Additionally, visualizing success and reminding oneself of the reasons for starting the journey can help maintain focus. Lastly, regularly reassessing and adjusting fitness plans can keep them fresh and aligned with personal interests and lifestyle changes.