{% for gym_data_root in datas[key] %}
<div class="row" style="justify-content: center">
<div class="collapse" id="{{gym_data_root}}" data-collapse-group="collapse-group">
<div class="well content-wrapper">
{% for real_content in gym_content_keys[gym_data_root] %}
{% if gym_data_root == 'daily-workouts' %}
{% for i in range(15) %}
<div class="col-md-4 ">
<img class="make_bigger workout-img" src="/{{gym_content[gym_data_root][real_content]}}">
</div>
{% endfor %}
{% else %}
{% for i in range(15) %}
<div class="col-md-4">
<video class="workout-video" width="320" height="240" controls>
<source src="/{{gym_content[gym_data_root][real_content]}}" type="video/mp4">
<!-- <source src="movie.ogg" type="video/ogg">-->
Your browser does not support the video tag.
</video>
</div>
{% endfor %}
{% endif %}
{% endfor %}
</div>
</div>
</div>
{% endfor %}
</div>
</div>