For many activities, playing self means

The phrase "playing self" typically refers to engaging in activities in a way that prioritizes one's own enjoyment, personal expression, or intrinsic motivation, rather than focusing on external metrics of success or competition.

From the options you've listed:

- Not seeing progress: This could relate, as it suggests that the activity isn't focused on measurable outcomes, but rather on personal enjoyment or self-expression.
- Wearing protective equipment: This is likely related to safety rather than the concept of "playing self."
- Playing alone: This could also relate, as playing self can mean engaging in activities independently.
- Not warming up or cooling down: This could suggest a more carefree approach, but it's not directly related to the concept of personal engagement.

The most fitting option might be "Not seeing progress," as it resonates with the idea of engaging in an activity for personal enjoyment rather than focusing on improvement or external validation. However, "playing alone" also captures the essence of engaging in activities for oneself.

So, the answer could be a combination of "Not seeing progress" and "Playing alone."