So since the beginning of this week, I've been doing 40 push-ups, 40 sit-ups, and 40 squat thrusts. Is this a good idea?
It all depends on where your skill level is at. You should be pushing yourself if you want to see gains, so it could be that 40 pushups is a breeze or next to impossible.
Sit-ups are good (as far as I understand) for toning your body, but not so much for developing core strength. I know that weightlifting squat and deadlift with proper form will cause MUCH higher strength gains in your core than just doing sit ups or good mornings. Other exercises that require a lot of core strength (and will thus cultivate core strength if you try them) are the planche
Squat thrusts are good, but burpees
are better. They are basically squat thrusts with a pushup thrown in for good measure. If you can do 40 squat thrusts in a row, then you're in pretty good shape.
Another thing you really want to bring into your training are pullups. Upper body strength and conditioning is pretty vital to parkour, especially with things like climb ups and vaulting. You can do pull ups a multitude of ways, but I've found that the most beneficial to most parkour movements is with your palms facing away from your body. It engages your lats the most, while still stressing the biceps a little.
Obviously, I basically just pointed to the first part of the APK Warmup
. Doing the whole thing ought to get your blood pumping pretty nice, and I always do an abbreviated APK warmup before I lift. Another thing to keep in mind is the importance of stretching after every workout. Muse_Of_Fire wrote a great article on stretching and flexibility here
We can talk about this more on Saturday, but until then: happy training!