plank type movements& ball static supine bridges

[MACHINE5150]

just curious, i incorporated these into my workouts replacing lower back extensions as well as weighted machine abdominal crunches.. my question is this.. i am able to hold position for 40-45 seconds (and probably could have held even longer)three sets each on both.. and i don't feel as if it is giving me a good pump.. my question is, is that normal?? i am only used to doing something that includes doing reps so when it comes to holding position for 45 seconds it just feels odd.. i mean is there a way to do this exercise and make it more difficult?? i looked around on Youtube and they didnt really go into detail on stuff like this.

any advice is appreciated

[HawaiianPride.]

Prone bridges, one arm one leg prone bridge, side bridges with hip abduction/hold weights, sprints ect. Dynamic movements such as dumbbell/kettle bell swings, turkish get-ups, shovel dead lifts, barbell torques, are all good core developers.

[MACHINE5150]

Prone bridges, one arm one leg prone bridge, side bridges with hip abduction/hold weights, sprints ect. Dynamic movements such as dumbbell/kettle bell swings, turkish get-ups, shovel dead lifts, barbell torques, are all good core developers.

okay.. grand. i knew there had to be somethin more too it then just sittin there for close to a minute... thanks for the tip -cheers

[BIGB]

try doing the bridges on a small swiss ball so your on your toes on the floor and elbows close together on the ball do small clockwise and counterclockwise rotations and if possible to side planks on the ball as well this activates many stabilizing muscle and causeinig you to have i guess you could say a faste nervous sysytem response to stabilizing your core. so tendons and ligaments don't take the brunt of the load when your doing normal lifts.