Don’t know if I get you right, but how about a nested foreach loop, something like this:
<table>
<?php foreach($page->training()->toStructure() as $item): ?>
<?php $count = count($item) ?>
<tr>
<?php foreach($item as $key => $detail): ?>
<td><?= $detail ?></td>
<?php endforeach ?>
</tr>
<?php endforeach ?>
</table>