During Mercury Retrograde communications have a way of getting misunderstood and misconstrued. If you're starting a new job take the vacation days from the old one and begin it after Mercury goes direct. This also applies to all kinds of agreements and contracts. Negotiations can continue while Mercury is retrograde but don't sign the papers till it's direct. Mars the God of war, rules action, construction, physical energy and motion.
Individuals are less likely to initiate activities during a Mars retrograde period.
Falling in the midst of the most favorable construction period it's an unpropitious time for any type of building or remodeling. Those projects continuing under this period will proceed slowly and need additional work when Mars is no longer retrograde. Generally while Mars is retrograde the parts of the body ruled by the sign Mars is transiting through tend to be under stress. Sagittarius rules the hips, thighs and sciatic nerve. Sciatic and lower back pain are more likely to occur.