Mnemonics were seen to be more effective for groups of people who struggled with or had weak long-term memory , like the elderly. Five years after a mnemonic training study, a research team followed-up 112 community-dwelling older adults, 60 years of age and over. Delayed recall of a word list was assessed prior to, and immediately following mnemonic training, and at the 5-year follow-up. Overall, there was no significant difference between word recall prior to training and that exhibited at follow-up. However, pre-training performance gains scores in performance immediately post-training and use of the mnemonic predicted performance at follow-up. Individuals who self-reported using the mnemonic exhibited the highest performance overall, with scores significantly higher than at pre-training. The findings suggest that mnemonic training has long-term benefits for some older adults, particularly those who continue to employ the mnemonic. 
For beginners who are concerned about their motivation or ability to walk far, I recommend the "five minutes out, five minutes back" plan. Just like it sounds, you walk out for five minutes, turn around, and walk back. If you feel ambitious, you can start with 10 minutes out, 10 minutes back, and off you go about your day! Increase by two to three minutes per week and before you know it you'll be up to 30 minutes. It sounds too simple to be true, but this is a realistic and achievable way to get started, and if you follow it, you'll be walking plenty before you know it.