| Δ0 | seated tai chi movements for seniors themselves | chair-based tai chi for seniors |
| Δ1 | other seated/chair-based gentle exercise programs for older adults | chair yoga, seated stretching classes, chair aerobics, seated resistance-band exercises |
| Δ2 | other low-impact exercise programs for seniors | water aerobics, gentle walking groups, standing tai chi, balance training classes |
| Δ3 | general fitness activities for the broader adult population | jogging, swimming laps, cycling, weightlifting, group fitness classes |
| Δ4 | everyday wellness habits unrelated to structured exercise | getting a full night's sleep, eating balanced meals, staying hydrated, social visits with friends |
| Δ5 | topics essentially unrelated to health or exercise | learning a foreign language, home gardening, watching documentaries, assembling puzzles |