関連ワード:  is running 3 days a week enough    is running 3 days a week enough for marathon training    is running 3 days a week enough for half marathon training    is running 3 days a week enough to lose weight    is running 3 days a week enough reddit    is running 3 days a week enough to improve    is running 3 times a week enough    is running 3 times a week enough to lose weight    is running 3 times a week enough for half marathon training    is running 3 times a week enough to improve