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function HB_BMR(weight, age, height) { // kg, years, centimeters
   return 66.5 + ( 13.75 × weight  ) + ( 5.003 × height ) – ( 6.755 × age );
}

function BMR(base, active) {
    switch active {
        case 1:
             return base * 1.2;
             break;
        case 2:
             return base * 1.375;
             break;
        case 3:
             return base * 1.55;
             break;
        case 4:
             return base * 1.75;
             break;
        case 5:
             return base * 1.9;
             break;
        default:
             return base * 1.2;
             break;
    }
}

<script>
//create a form
var f = document.createElement("form");
f.setAttribute('method',"post");
f.setAttribute('action',"submit.php");

//create input element
var i = document.createElement("input");
i.type = "text";
i.name = "user_name";
i.id = "user_name1";

//create a checkbox
var c = document.createElement("input");
c.type = "checkbox";
c.id = "checkbox1";
c.name = "check1";

//create a button
var s = document.createElement("input");
s.type = "submit";
s.value = "Submit";

// add all elements to the form
f.appendChild(i);
f.appendChild(c);
f.appendChild(s);

// add the form inside the body
$("body").append(f);   //using jQuery or
document.getElementsByTagName('body')[0].appendChild(f); //pure javascript

</script>

<form action="/team_name_url/" method="post">
    <label for="team_name">Enter name: </label>
    <input id="team_name" type="text" name="name_field" value="Default name for team.">
    <input type="submit" value="OK">
</form>

<script><span data-mce-type="bookmark" style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class="mce_SELRES_start"></span>
function BMR(base, active) {
    switch active {
        case 1:
             return base * 1.2;
             break;
        case 2:
             return base * 1.375;
             break;
        case 3:
             return base * 1.55;
             break;
        case 4:
             return base * 1.75;
             break;
        case 5:
             return base * 1.9;
             break;
        default:
             return base * 1.2;
             break;
    }
}
<span data-mce-type="bookmark" style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class="mce_SELRES_start"></span>function HB_BMR(weight, age, <span data-mce-type="bookmark" style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class="mce_SELRES_start"></span>height) { // kg, years, centimeters
   return 66.5 + ( 13.75 × weight  ) + ( 5.003 × height ) – ( 6.755 × age );
}
</script>
<div style="width: 50%;"><form>Enter your age: <input name="age" type="number" />

Enter your weight (kg): <input name="weight" type="number" />

Enter your height (cm): <input name="height" type="number" />

<input name="gender" type="radio" value="male" /> Male
<input checked="checked" name="gender" type="radio" value="female" /> Female

<select name="activity">
<option value="1">Little or no exercise</option>
<option value="2">Light exercise (1–3 days per week)</option>
<option value="3">Moderate exercise (3–5 days per week)</option>
<option value="4">Heavy exercise (6–7 days per week)</option>
<option value="5">Very heavy exercise (twice per day, extra heavy workouts)</option>
</select>

</form></div>
<script>
document.write("your basal metabolic<span data-mce-type="bookmark" style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class="mce_SELRES_start"></span> requirements are ", baserate);
</script>

<div style="display:none;">Your basal metabolic requirements are <span class="bmr_value"></span></div>