To do it: Lie on your back with your knees bent, feet flat on the ground. Bring both arms overhead and hold onto the bottom of couch or a heavy medicine ball (as shown). Cross your right ankle on top of your left knee. Exhale and lift your legs in (in the same cross-legged position) as close to your chest as possible, lifting your hips and lower back off the floor. Inhale and slowly return to the starting position. That’s one rep. Try for up to 15 reps with the right leg, then repeat on the left.
Lie on your back and bend your knees, placing a Swiss ball across your hips. With your hands on top of the ball and your body crunched forward as demonstrated, push your arms down as hard as possible for six seconds. The harder you push, the more the ball will resist you, giving your abs an intense stimulus. Exhale, relax for a few seconds, and then repeat.
When you're doing exercises to strengthen these muscles, think of the abs and core as one unit. Even when you do exercises that recruit more of one muscle than the others (for example, side planks that really fire up the obliques), you'll notice that you still have to engage your entire midsection to do them right, which is proof that these muscles are never working completely alone. It's important to show equal love to all of the muscles of the core so that this unit can power itself properly from all angles.
“If you need a small treat and indulgence per day, to keep you from overdoing it on the weekends,” says Shapiro, go for it. Just be sure to “stick to about 150 calories or less.” It’s a small trick to help you stay on-track. For a good sweet treat, consider dark chocolate (that’s a bar with a 70 percent or higher cacao rating). According to a study in Circulation Heart Failure, the flavanols within can slash your risk of heart disease by more than 30 percent.
My Cardio and Callisthenics circuits really helped me increase my stamina and perform like an athlete. Some of my favourite ones are Burpees, Crab Walk, Jumping Jacks, Jumping Squats, Kettle bell runs and in general, circuits variations that really push me to the limit. I followed an HIIT program on the treadmill where I would run for 2 minutes and walk for 1 for a total of 12 minutes. I used the preprogrammed interval training option on the elliptical and stepper machine. I also went to the park sometimes for my workouts. You’ll be surprised at how different and relatively harder it is to train in the open.
But instead of just trying to perform as many reps as possible, slow down and really focus on the quality of the movement—especially the eccentric, or downward motion, of the exercise, he says. “The eccentric contraction is the most important phase when sculpting any muscle.” Plus, focusing on quality over quantity will help protect your back (some experts say crunches can be potentially troublesome for guys with back issues.) 
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