Regular exercise helps to keep illness at bay and boosts your immune system.

At length, my wish was realized.

After a long day, I sat quietly, feeling completely at rest.

What are you trying to drive at with your explanation?

At first thought, the solution appeared straightforward, but further examination revealed unexpected challenges.

During our debate, when my colleague subtly changed the subject, I demanded, 'what are you getting at?' to understand his point.

After trying every solution, Sarah was at her wits' end, unable to fix the stubborn software glitch.