This well-intended idea from British Airways reminds me of companies that want their overworked employees to just chill out with mindfulness so they can be more productive.
While focusing on relaxation in the body will help (if practiced consistently over time as is true for any skill), nobody wants to learn new coping strategies from the people who they perceive to be orchestrating their immediate discomforts.
Watching the more mindful people in first class get their feet massaged with eucalyptus oil probably won't help either.
Unsolicited relaxation tips will result in increased agitation, resentment, and passengers defaulting to familiar, preferred numbing strategies.
Carry on your own strategy. Make sure it accounts for present moments that are very likely to be unpleasant. And spend some time practicing it before you need it.
If you do find bliss in your tiny little seat, please don't tell anyone. Share it indirectly by being kind.