I read a few guides concerning push up programs and training the belly muscles and started my own routine, based on what I read. However I also read in this SE that an unbalanced training (e.g. only push ups) can be unhealthy.
I'm a fairly active person, I try to run 5-7 km once or twice o week. The idea of my training is just to keep in shape, not to achieve any particular weight loss/muscle building goals. My morning routine consists of:
Weider's Series for the belly everyday: http://www.300situps.com/additional-information/various-types-training/weider-6-pack-training (but not the whole program - just the idea of the exercises, which I progressively prolong if I get used to a previous setting - right now I'm doing 8 series)
Push ups every other day:
7 push ups | 1 min holding in "down" push up position | 1 min break |
8 push ups | 1 min holding in the "up" push up position | 1 min break |
7 push ups | 1 min holding in the "down" push up position | 1 min break |
7 push ups | 1 min holding in the "up" push up position | 1 min break |
8 push ups | 1 min holding in the "down" push up position | 1 min break |
When I'll get comfortable with this setting, I plan on adding +1 push up to every series.
So my question is: is this an OK training routine and should I be worried of any balance/spine/general health issues? If yes, then what do you suggest I should change/add? I'll be very grateful for any suggestions!