Each component of a Workout has a Scoring section. Click its dropdown to for options.

Next, click Actions > Edit

Next, click a pencil icon next to the component you'd like to add Scoring for.

Lastly, click the Scoring dropdown and start adding criteria.

You can add multiple scoring options if its warranted. Here's another Workout Component that has more than one.

This workout component tells the customer to do 20 pull ups and time themselves. For the Primary Scoring we've chosen Time. For Unit we've chosen minutes. For secondary we've added an option to report as many reps as possible (AMRAP). In the description we've added some short instructions so that customers know what to expect before starting the workout.