An inactive adult can currently only manage 10-minute walks twice per week. Which of the following first-week modifications best reflects the principle that 'some exercise is better than none' while preparing for gradual progression?

• A. Immediately mandate daily 60-minute aerobic sessions, because drastic increases force adaptation faster and will lead to better outcomes quickly.
• B. Increase to three 12-minute walks in the first week (add one session and modestly extend duration), continue monitoring response and plan gradual increases in subsequent weeks — small, achievable step that preserves adherence.
• C. Stop all walking and replace with a single weekly long hike of 120 minutes to jump-start fitness quickly and spare time commitment on other days.
• D. Keep the same schedule indefinitely to avoid any perceived risk and then decide after six months whether to change anything, since consistency without progress is the safest route.

Answer: (B)