Here's a Beginner 4-Week Ab Challenge to get stronger core and tighter mid section.

Week 1 & Week 3
1) Push Through -- 25 reps
2) Bicycle Crunch -- 25 each side
3) Burpees -- 10 reps
4) Vertical Leg Lifts -- 25 reps
5) Russion Twist -- 25 each side
6) Burpees -- 10 reps
**Rest 1 minute & repeat

Week 2 & Week 4
1) Mountain Climbers -- 20 seconds
Rest -- 10 seconds
2) Cross Scissors -- 20 seconds
Rest -- 10 seconds
3) Flutter Kicks -- 20 seconds
Rest -- 10 seconds
4) 4 times abs -- 20 seconds
Rest -- 10 seconds
5) Plank -- 1 minute
Rest -- 10 seconds
6) Jumping jacks -- 1 minute
**Rest 1 minute and repeat

Important steps to follow for effective result:
- Week 1 & 2 - Repeat 2 sets / Week 3 & 4 - Repeat 3 sets
- Do this 5 times in a week.
- Focus on proper technique.
- Drink 3-4 litres of water each day.
- No sodas, fast food and junk food.
- Eat clean & follow my "Full Meal Plan".
- Incorporate this into your workout plan.
- After the challenge has ended, continue doing ab workouts 3 times weekly.