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HTML

              
                <body onload="myFunction()">
  
          <div style="text-align:center">
            <p>
              <form>
                <label for="points">Number of exercises:</label>
                <input id="userInput" type="range" placeholder="6" value="6" step="1" min="1" max="" oninput="numberOutputId.value = userInput.value">
                <output name="numberOutputName" id="numberOutputId">6</output>
              </form>
            </p>
            <p>  
              <input class="btn" type="button" value="Create new workout" onclick="myFunction();" />
            </p>
          </div>
            <ol id="todays_exercises"></ol>

</body>

              
            
!

CSS

              
                body {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 28px;
}

  #todays_exercises {
  border-radius: 5px;
  border: 1px solid LightGrey;
  max-width: 350px;
  margin: auto;
  box-shadow: 0px 0px 10px 0px rgb(0 0 0 / 15%);
  padding: 30px;
  padding-left: 80px;
  list-style-position: outside;
  margin-top: 50px;
  line-height: 40px;
  margin-bottom:50px;
  }

.btn {
  border-radius: 5px;
  text-transform: uppercase;
  color: #ffffff;
  font-size: 0.8rem;
  background: #0075FF;
  padding: 15px 15px 15px 15px;
  text-decoration: none;
  border-style: none;
}

.btn:hover {
  filter: brightness(125%);
  text-decoration: none;
  cursor: pointer;
}
              
            
!

JS

              
                // get the slider value
    function getNumber(){
        let input = document.getElementById("userInput").value;
      return input
    }

//triggered by the main button: set the number of exercises to "n"
    function myFunction() {
    let n = getNumber() 

//clear the list of any existing exercises
    document.getElementById("todays_exercises").innerHTML = "";

//define the array
    let all_exercises = [ 
      " air squats ×40",
      " skip ×200",
      " burpees ×20",
      " row 500m",
      " pull-ups ×10",
      " finger board pull-ups ×10",
      " ring pull-ups ×10",
      " sit-ups ×40",
      " press-ups ×25",
      " lunges ×20",
      " curls ×15",
      " ring rows ×12",
      " assisted ring dips ×10",
      " ring push ups ×10",
      " power snatch ×10",
      " power clean ×20",
      " power clean & jerk ×15",
      " hanging leg raises ×20",
      " bench press ×10",
      " calf raises ×20",
      " plank 20s",
      " dips ×20",
      " row 250m"
    ];

//Set the max value of the slider (with id=userInput) to the # of elements in the array
    document.getElementById("userInput").setAttribute('max', all_exercises.length);

// shuffle the full array
    function shuffleArray(array) {
        for (let i = array.length - 1; i > 0; i--) {
            const j = Math.floor(Math.random() * (i + 1));
            [array[i], array[j]] = [array[j],  array[i]];
        }
    }

// pull out the first n values from the shuffled array and display as ordered list
    shuffleArray(all_exercises);
    all_exercises.slice(0,n).forEach(e => {
        todays_exercises.innerHTML =  todays_exercises.innerHTML + '<li>' + e + '</li>' ;
    });
    }
              
            
!
999px

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