To begin the process of self-discipline, you must first clearly define your goals and the reasons behind them. You won't have direction or motivation if you don't have a clear and significant aim. In addition, you're more inclined to quit when faced with difficulties or hurdles.
As a result, you must specify and record your goals. Make sure your objectives are Time-bound, Relevant, Specific, Measurable, and Achievable (SMART). Say "I want to lose 10 kg in 3 months by following a healthy diet and exercising 4 times a week" as an example, rather than just "I want to lose weight."
You will be more likely to remember and adhere to your goals if you put them in writing. It will also enable you to monitor your development and recognize your successes.