Fast Days, The Three Weeks

I am unable to fast or even reduce my food intake due to a medical condition. This gives me a level of energy on fast days that one who fasts does not have. Would there be an issue with me building my sukkah on Sunday, the fast of Gedaliah, when one who is fasting would have great difficulty doing that?

A person has been told that in the opinion of a doctor and/or rabbi (or multiple doctors and/or rabbis), they are able to safely fast. But they personally feel that fasting (or eating less food than normal) could be detrimental to their health. Are they permitted not to fast?

My Occupational Therapist urges me to swim 3 times a week as post-surgery therapy for a broken wrist. She says the water gliding will give me more mobility and accelerate healing. I have done this for a month already and it definitely seems to help. My question is, can I swim during the 9 days starting tonight for therapeutic reasons?   Thank you! Sara F

Can i do water activities in the 9 days??

I’m aware that most opinions are that swimming during the nine days is not allowed, unless it is for exercise and is not to cool off and is not enjoyable. Without making this a detailed discussion, I use swimming for exercise, which is important right now as I’m between multiple surgeries (trying to keep physically active and strong), but the truth is that I do enjoy swimming, and it IS something that cools me off, just by the fact that I live in an area with temps over 110 degrees. Am I permitted to swim 1) on Rosh Chodesh Av, and/or 2) during the nine days? Thank you.

If the first day of the 9 days is Rosh Chodesh, then why is that day observed as a day of mourning? On the contrast, if it is a day of mourning, then why is Hallel still recited?

If a Jew does something during the three weeks that is forbidden during that time (e.g. listening to music, getting a haircut), have they actually sinned according to Halacha? Is it a sin, just like violating Shabbos or eating treif are sins? Would the term ‘avera’ be applied to such an action? Is the intentional, willful violator of the three weeks restrictions required to make atonement?

The Torah makes clear the punishment for failure to fast on Yom Kippur - kareis. Is there any punishment for refusing to fast on one of the other five fast days when one has no medical reason to avoid it?

A relative of my wife is getting married toward the end of July. We looked on the calendar and realized this is during the three weeks. What we found out is they are Sefardi, and the Sefardi custom is that weddings may be held during the three weeks before the nine days begin. We are Ashkenazim. What do we do about this? Can we attend the wedding?

If one fails to fast on Yom Kippur when they have no medical reason not to fast, the punishment is koret. Is there any punishment for one who neglects to fast on a minor fast day when they are medically able? Is it considered sinful to neglect such a fast?