Abdominal exercises also put some degree of compressive force on the lumbar spine, putting unwanted stress on the lower back. In addition, exaggerated abdominal exercise can cause respiratory problems.[7] A study of twelve exercises concluded that no single exercise covered all abdominal muscles with high intensity and low compression.[8] - High challenge-to-compression ratio
- Crunch with feet anchored
- Crunch with feet free
- Bicycle crunch
- Hanging straight leg raise
| - Low compression, lower challenge
- Crunch with feet anchored
- Crunch with feet free
| - High challenge, higher compression
- Straight-leg sit-up
- Bent-leg sit-up
| - Low challenge-to-compression ratio
(not recommended!)- Supine straight-leg raise
- Supine bent-leg raise
- Hanging bent-leg raise
- Static cross-knee crunch
|
The benefit of focused training on the "deep core" muscles such as the transversus abdominis has been disputed, with some experts advocating a more comprehensive training regimen.[9] [edit]
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