Drums 2: Intermediate (fills, rudiments, styles)

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I'm learning "Drums 2: Intermediate (fills, rudiments, styles)" on The Future Market. Lesson 1: "Warm-ups and the rudiment system".

What the lesson teaches:
- The Percussive Arts Society (PAS) publishes the 40 International Drum Rudiments, copyrighted in 1984. The list includes the traditional Standard 26 American Drum Rudiments plus drum corps, orchestral, European and newer rudiments.
- PAS groups the 40 into four families: roll rudiments (#1-15), diddle rudiments (#16-19), flam rudiments (#20-30) and drag rudiments (#31-40).
- PAS advises practising rudiments "open (slow) to close (fast) to open (slow)", or at an even, moderate march tempo.
- Single stroke roll (#1): R L R L R L R L
- Double stroke open roll (#6): R R L L R R L L. The second stroke of each pair should be as loud as the first.
- Hearing check-in: even a practice pad session next to a kit can get loud. Health Canada advises hearing protection designed for musicians, breaks between sets in a quiet area, and quiet time after practice.

The exercise I'm working on:
Metronome, 8th notes, earplugs in if near a kit. - 2 minutes: wrist and finger stretches. - 4 minutes: single strokes at 70 BPM, then 80, then 90, then back to 70. - 4 minutes: double strokes at 60 BPM, then 70, then 80, then back to 60. - 2 minutes: write down the highest tempo where both stayed even and relaxed.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "Warm-ups and the rudiment system" from the course "Drums 2: Intermediate (fills, rudiments, styles)".

Here's what the lesson says:
Rudiments are like the ABCs for drummers. Letters make words, and rudiments make beats and fills. We practise them slowly first, like learning to write neatly before writing fast.

The activity:
Metronome, 8th notes, earplugs in if near a kit. - 2 minutes: wrist and finger stretches. - 4 minutes: single strokes at 70 BPM, then 80, then 90, then back to 70. - 4 minutes: double strokes at 60 BPM, then 70, then 80, then back to 60. - 2 minutes: write down the highest tempo where both stayed even and relaxed.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.