An incline crunch will work your muscles harder than a horizontal crunch, but I agree with Zorbs - it is still an isolation exercise that only really works the abs. Planks are a compound exercise that works a much broader range of the core muscles, including the abs.
Isometric is rather different to isolation. Isometric is basically about holding a position - basically a motionless strength exercise rather than a lift. Isolation is about only really working one muscle at a time. A plank is an example of an exercise that is isometric, but most definitely compound. (My apologies - I don't usually jump all over the wording, but in this case it significantly changes the meaning.)
Because they run in a defined track, many (but not all) machines tend to be isolation exercises. But with free weights, you tend to use a much broader range of muscles to keep yourself balanced and stabilized, and free weights tend to be more compound exercises. A squat with barbells will work a much broader range of muscles than a squat machine.
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Thanks. That was good to know. I found many of the machines I use at the gym are isometric, but I figure I get some good out of them, and am rotating to many machines to get zoned in on various muscles. And other machines qualify for compound exercises - like the one that requires crunches from a leaning back position all the way forward over the knees.
Exercises that use multiple joints/muscle groups. Examples are: pushups, squats, lunges, deadlifts, rows, pullups.
The opposite would be isolation exercises, which are considered by many to be unnecessary for general fitness, as the body does not use muscles in isolation. Examples would be: inner thigh machine, bicep curl, lateral raises, leg extension machine.
Sometimes people cobble together 2 isolation exercises and call it a "compound exercise" (example: front DB raise + inner thigh squeeze on stability ball) but that's just 2 isolation exercises done at the same time.
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