There will be a lab roughly once a week, when the students should follow the labnotes and complete the labwork as assigned within the notes. It is strongly recommended that students read the relevant part before walking into the lab.
Use radio buttons, as shown in a pair of files workout_calc_radio.html, and wc_handler_radio.php; or use check boxes as shown in workout_calc_chkbx.html, and wc_handler_arrays.php; or a multi-dimensional array as shown in workout_calc_multi_array.html, and wc_handler_multi_array.php.
Here are the text for the php scripts: wc_handler_radio.php; wc_handler_arrays.php, and wc_handler_multi_array.php.