It varies depending on the situation. For example, when you wake up in the morning, you can start your day with a small act of balance, or you could practice patience with people at work or at home who are irritating you, choosing not to respond immediately but to remain silent, for instance. This can all be considered penance choosing not to watch television, for example.
Penance can also involve praying on your knees for a period of time when it is physically possible for you, and so on. There are countless occasions throughout the day. I would suggest asking your guardian angel, 'Please, my good guardian angel, guide me in what simple, small act of penance I can do today.' I believe the guardian angel will remind you.
Dear visitors of Gloria Dei and all who have already written or who will write a personal message to me. I am grateful for your attention, your kindness, for your spiritual support and especially for your sacrifices and prayers for me. God may reward you!