Pistol grip for smartphone

I am looking for opinions/advice on using my smartphone as my camera on the trail. I’d like to shoot some video but feel holding the phone while hiking is risky—i.e., I don’t want to drop it.

Does anyone use a pistol grip to add security and ease of use?

Any ideas/suggestions?

I’ve found a few that look promising:

Shoulderpod S2, which is a bit heavy (147 grams / 5.1 ounces, according to an email from the manufacturer)

https://www.bhphotovideo.com/c/product/1313352-REG/shoulderpod_sd_s2bk01eu0001_s2_smartphone_handle_grip.html

GRIPT Rig—looks well designed, secure and light (2.24 ounces, according to item description. Does not include a handle. I think a handle needs to be added because the velcro is small.

https://www.amazon.com/GRIPT-Secure-Smartphone-Rig-Universal/dp/B0185CS0AG/ref=sr_1_1?ie=UTF8&qid=1496435652&sr=8-1&keywords=GRIPT

Bike mount—I am not sure if it would be suitable.