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    <p>I'd probably go with creating custom data structures to model your scenario. For example.</p> <p>Set class with a weight property and a reps property.</p> <p>Exercise class with a name property and a collection of Sets.</p> <p>Workout class with a collection of Exercises and a date property for when the workout was done.</p> <p>That way, if you wanted to extend it to include food you eat that day, you could either add it to the workout, or probably a better option would be to compose another class of a Workout and food eaten. </p> <p>That way you open the possibility to draw correlations between how well you trained on a certain day with what you eat.</p> <p>-- I'm a C# developer and I haven't touched Java before so apologies if the Syntax or the types aren't correct --</p> <pre><code>public class Set { public Set() { this._weight = 0; this._reps = new ArrayList&lt;int&gt;(); } private BigDecimal _weight; private List&lt;int&gt; _reps; // implement public properties / methods } public class Exercise { public Exercise() { this._name = ""; this._sets = new ArrayList&lt;Set&gt;(); } private String _name; private List&lt;Set&gt; _sets; // implement public properties / methods } public class Workout { public Workout(Date workoutDate) { this._date = workoutDate; this._exercises = new ArrayList&lt;Exercise&gt; } private Date _date; private List&lt;Exercise&gt; _exercises; // implement public properties / methods } </code></pre> <p>Then you'd be able to store a List and order them by Date using a custom implementation of <code>Comparator&lt;Workout&gt;</code></p>
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