What's a superseries?
A superseries (or superset) is when you choose two exercises and do them in a row, with no rest between each of them.
They can be exercises for the same muscle or for two different muscles.
In this case, you would start by doing 8 repetitions of chest press with halter and, as soon as you finished these 8 repetitions, you immediately went to the openings and did 8 repetitions of this exercise.
It wasn't until the openings the end of the openings that you'd have a rest period.
In this case it would be a superseries for the same muscle, chest.
In this example, you would start with the tricep exercise with a bar on your forehead, perform 10 repetitions, and at the end of these 10 repetitions of tricep with bar the forehead, you would immediately go to the bicep curl exercise with a bar, without rest.
It was only at the end of the bicep curl that a series of this superseries and the beginning of a short period of rest were completed.
In this case it would be a superseries for two different muscles and antagonists, tricep and bicep.