Kristy Thomas. Kristin Kristy Amanda Thomas is a main character in The Baby Sitters Club books by Ann M. Martin. Kristy made her first appearance in Book #1, Kristy's Great Idea. Kristy is the creator and president of The Baby Sitters Club.
Itâs important to exercise your abdominal muscles, but not necessarily every day. While ab exercises are one of the few workouts you can safely perform five or more times per week, itâs really not necessary and can actually have a negative impact in some cases. Thereâs a big difference between âcan youâ exercise your abs every day and âshould youâ work these muscles daily. For the average person, daily abdominal exercise isnât any healthier than working your abs one to three times per week.
1 Work out your chest muscles no more than once or twice per week. On the days when you aren't working out your chest, work other muscle groups, like your legs, arms, and back.  Don't work out for longer than 30 minutes in a session.